Mr. Kelley, I've been in the automotive field since 08 when I graduated from U.T.I. I worked at a few Chrysler dodge jeep dealers and took their basic courses on hybrid vehicles,much of which I have forgotten over the years working in independent shops,and hybrids just were not as common as they seem to be getting now. Today I had a 2013 Lexus rx400h get assigned to me for a no start complaint. I searched high and low on all data with no success in gaining any info or description and operation on how the system works and keeps the 12v battery charged,as I didn't just wanna throw a battery in it I wanted to verify the system was operating as designed... and I remembered your videos and this is just what I needed. I can't thank you enough for putting this info on TH-cam for Free! I would love to be able to come take your classes in person,but its just to far away for me in Ga.
@@WeberAuto i have been working on a prius with a code p0A08 is it possible to point me in right direction? 12 v charges hybrid battery in fairly good shape changed inverter pump was serious blockage flushed system l, turbulence is in reservoir, hybrid battery charges but something still triggers this code after a few minutes
John, I tried the "no ring while working on the car" in the past but the wife wouldn't buy it! Great video. Thanks for all the time and effort you put into your channel. Knowledge is addictive.
Professor - 2013 Prius 3 owner since new (251K miles) who does most maintenance DIY. Just finished rebuilding ICE side (head gasket & other “it’s time” parts). This series opens up a whole new understanding of the hybrid side, and possibly another 250k miles 🙂. Thank you!
Hi Professor. Thank you so much for invaluable information. I own 2007 Prius and I have been my own mechanic since 2013 when inverter/converter unit went out. It took dealership 3 hours to troubleshoot it, cost me $318, California rates. Again dealership charge me $500 to replace low voltage battery, and finally $500 to replace burnout HID headlights. It was totally ripoff. Well, that was then. I finally figure out how to work on this vehicle now. Your information is helping filling the caps. Thank you once again for your time.
This video clears a crystal clear idea that Low voltage system has no connection with engine start or stop and it's charging. Even research papers can't explain it so clearly. Thank you.
Thank you so much for these videos. Our 1st Prius was a 2001 hand built in Japan we ordered on the internet. Since then, we've owned 2008 2013 and a 2018 Prime. Your postings have been so helpful in my understanding and appreciation of this astonishing engineering. You are a master teacher.
It's worth mentioning that AGM batteries have a security overflow drain pipe. We saw it in the video at 22:25. These batteries are entirely sealed and any generated gases are vented through that tube instead of inside the cabin. This is why AGM batteries are used in vehicles whose 12v battery is in the cabin.
Having your attention, I have to say how greatly I've enjoyed your videos since I discovered them earlier last week. I've been binging on them for a while now. And in this one, I have to say it's a sweet classroom setup. My auto mechanics classes in high school (in the 80s) were more... traditional.
I appreciate this series, and I hope I am not wasting anybody's time with a personal comment. In the 1920s my grandfather owned an automotive electrical service business in Wichita Falls, Texas, and also manufactured his own line of automotive batteries. Watching this video, I could not help but wonder what Grandpa might have thought of today's technology and problems, such as not being able to get to a dead battery because it was locked in a trunk that can only be opened electrically. Please keep up the good work--I just bought a 2018 Camry Hybrid and I need all the help I can get in understanding it.
@@WeberAuto Hi John I have watched almost all your marvellous videos and was wondering if you could possibly help answer a question please. If the HV battery had been left standing for a long time like going away for 6 months, if the battery was then almost flat could I still start the vehicle using the jump start connector or would the HV battery need to be charged at a Toyota dealership.??? Many thanks for all your great work.👍👍👍
I have a 2016 RAV4 Hybrid and I'm loving these videos. I used to do all my own maintenance when I was younger, but I rarely am able to even "converse" with someone about anything to do with my vehicle and feel out of sort anymore. You're educating me at least to the point where I can tell if a "Certified Technician" at the dealership is bull shitting me or not. I'm feeling better already. Thank you for all you do!! Jim.
I am much older than you; grew up with points and condensers. Your videos allow me an accurate, detailed, and intelligent insight into the newest technology. And, as always, a wonderful presentation. Thank you for sharing.
I gathered lot of information from you which is very usefull and valuable for everyone, who has hybrid vehicle. from srilanka . 🇱🇰 Thank you professor kelly.
Thanks for the video! How do you think, the charge current of the auxiliary battery more than 4.2 amp after switching on the car? Have you measured it?
Yes the current goes much higher if necessary, but the battery temperature is monitored by the DC to DC converter and it will turn down the current if the battery starts to get too hot. External chargers do not monitor the battery temperature so the charge current must be limited to prevent overheating the battery.
Thank you very much indeed, for making this top quality instruction available to all that are interested. Your willingness to share your expertise in a very down to earth and modest delivery is greatly appreciated. Cheers 👍
Mannn.... You are the perfect teacher and that's only because of a lack of words. I follow you because of this and because within my strong opinion; Your way might just be the way to teach hounest, seriouse technicians, the right way with comprehending that whih is needed in simple terms how to get this job done the right way, and it sticks. A Big... THANK YOUUUU
May God bless you greatly, your videos are a great blessing to those in need. Thank you very much for such important information provided, we appreciate it very much and I think you are the best on TH-cam, you are a great teacher. Muchas gracias...
Thank you for your information on the differences in12 volt batteries. I have a question for you, I have a 2023 Hybrid Tucson (not a Plug In)I am wanting to put the car on a trickle charge, as I am leaving the car in a garage for 6 months, but I have no battery in the engine compartment, I see a bare terminal on the inside of the fuse box, could I connect that with the positive and find a good ground, if that works do I need a special trickle charger?
Wow looking at all these other videos talk to try electronics on the prius, they dont compare to someone knowledgeable like you! Thanks for sharing and the effort you put on the videos! It's so detailed!
Hi professor Kelly, your videos are so so good. Can't thank you enough! Keep the the content coming. I wish you many more great years working on ever growing base of electric vehicles.
Sensing of batt temperature on LV battery is not for over heating safety. AGM batts are charged to different voltage depending on temperature, and i have seen Ford car killing batts with 15,5V at summer, because of dead temp sensor. Basically the colder the higher voltage, and limit is at about 15,5V at under -10 deg C. This systems are just correcting charge voltage to proper electro chemistry activity levels and are typical even in non hybrid start-stop engines, and in some cars without it too, even in flooded, classical batteries - it is beneficial in every case, 14,4V is really proper only in room temperatures
BTW, nowdays alternators can have digital charge controller build in with LIN connectivity to ecu and ecu can still be responsible for voltage management - poor ecu ground caused random charge voltage and charge message popping up to my client and it was actually hard to trace, as there is no way to check alternator by myself, and no errors were present anywhere
But batt temp sensor built in the battery is awful, it is ideal to be mounted in battery tray and i would prefer for it to not be in way of drainage - leaky battery kills it in volvos and fords :> Many brands are just using outside temp and correct for known drift, its still less awful than custom battery
Professor Kelly as an owner of a 2008 Prius I really appreciate the information you provide in your videos. I don't understand why the 12v Prius battery is limited to 4.2 amps charging for 10 hours when the DC to DC converter provides 150 amps continuously as required. Many Thanks in Advance! Jeff Erdmann
I suspect it's more of a paper recommendation to avoid overcharging and overheating the battery damaging it. I've used AGM batteries for over 20 years in hot rods I've built and they can be charged at higher amperages for short periods of time but it is very easy to overcharge and damage them. It's not easy to ascertain the charge state and calculate the charging time on the AGM batteries. Some of the early manufactured actually had a chart which one could carefully conservatively calculate charge time using high amperages for a very fast charge. Although I don't recommend it I have successfully hit both my 2007 and 2008 Prius's with dead low voltage batteries with 20 amps while disconnected for 15 minutes for a fast charge to get going quickly with the high voltage system finishing the charge while driving the car.
Hi, I started this Channel and have made all of these videos for my automotive students. I use them in my classes and assign some of them as homework. To my surprise, other automotive programs in high schools, colleges, and universities are also using them in their classes. Professional automotive technicians, weekend mechanics, and anyone else who is curious about automotive technology are also watching them.
Great explanation Professor. I have a question, is there a terminal good enough to take power from for let's say an 80 watt condenser fan? I live in the Middle East and in the summer the AC suffers in traffic. The car is 2019 Avalon hybrid
Thank you for your content. Quick question. Can someone disconnect the hybrid battery? Will this prevent parasitic draw on the 210 volt battery if you don't drive it for 6 month and will it still be as strong as the last time you used when you reconnect it?
If you add another 12v agm battery and connect an inverter to it to run 120v appliances do you need to have another DC to DC converter between the 2 AGM's?
Theoretically yes. The single DC-DC converter has a limited output and limited cooling abilities. See my video on testing the DC-DC converter th-cam.com/video/_V9PiOpaxyE/w-d-xo.html
Hi john superb series by the way have you any idea what type of 12v battery on a Toyota corolla touring sport 2.0 2019.....the Toyota forum that I go on are split on the awnser between AGM or normal acid type...Michael uk.
@@WeberAuto thanks for that, so this could be changed with any good quality 12v battery? why do you think this 2.0 hybrid corolla has a normal battery instead of a AGM...Michael uk.
Professor Kelly: so the 12V battery, since it is less than 12.5 at the terminal, is due for replacement or would you suggest to the customer that it can wait a little?
It is hard to tell without further testing. See my new video on checking the 12V battery and charging system on a hybrid or electric vehicle for more information: th-cam.com/video/_V9PiOpaxyE/w-d-xo.html
I guess Faraday's law is wrong: van.physics.illinois.edu/qa/listing.php?id=2354 however you can CONVERT DC: en.wikipedia.org/wiki/DC-to-DC_converter Thanks for encouraging me to use my brain. It is so hard with age. I appreciate you videos and learn a lot from them.
Pulsed (or modulated) DC power on the primary winding of a transformer will induce current into the secondary windings. You can step up the voltage (like an automotive ignition coil 12V to 20,000V) or you can step down the voltage (like in the high current DC-to-DC converters of a hybrid or electric vehicle 201V to 14.5V). Faraday's law describes a changing magnetic field, it does not have to be changed by AC power. The next video I will publish this weekend is on inverters and converters. You will be able to see the center-tap transformers quite clearly. Your article on Faraday's law was based upon a steady state DC, not modulated. Your wikipedia article, section 3.1 clearly states "In these DC-to-DC converters, energy is periodically stored within and released from a magnetic field in an inductor or a transformer". I hope that helps.
Drove our OEM 2009 Prius for ten years before replacing the engine battery, (not hybrid) before any issues. I used TH-cam to replace myself and although it is located over the right rear wheel and was a challenge to lift and replace, it is possible without a engineering degree to replace! Great information here, thx!
Which generation Priuses need that special battery? My daughter has a gen-1 and I believe it has a standard lead-acid 12V battery. We bought the car used, but it gets regular service at a Toyota dealership.
The first three generation Prius' have AGM batteries. They must be vented externally. Standard lead-acid batteries are not safe due to not being vented to the outside of the car. They area more likely to spill electrolyte inside the car in an accident as well.
They may call it auxiliary but it's essential. It makes some sense to me still have a low voltage battery, it allows the DC to DC converter to be sized slightly above the average power consumption. If there wasn't a battery, the DC to DC converter would have to be able to power all the headlights, the rear defroster, the horn, etc at the same time.
Yes, the temperature sensor is used to fine tune the high current charging system. If the battery gets too hot, the charge rate gets turned down. Thanks for your feedback!
Is there any way to raise the voltage im doing a car audio build than the lithium’s would work better at 15v but my Prius only does 14.1 I saw on another video the converter under the hybrid synergy drive is what puts out the 14.1 I have the Prius c so my guess is I wouldn’t have any luck but figured I’d ask anyways
How do you use the AGM charger at the fuse box to charge the auxiliary battery? You were going to explain it in this video, but you didn’t come back to it. I was unable to locate that. Thank you for your help!
Ahmed Zulfe The engine spins the shaft on a 3 phase brushless motor. This makes the brushless motor act as an AC generator. This is rectified and regulated to charge the high voltage pack. It is also possible for the drive wheels to drive the same shaft (as they are all 3 connected through an epicyclic gear set). In that situation the momentum of the car charges the high voltage pack. This happens during regenerative braking. Other times electrical power is applied to this motor to drive the wheels of the car or to start the engine. This one motor is not just a drive motor but also replaces the starter and alternator. Toyota’s Power Split Device transmission (they call Hybrid Synergy Drive) is truly an amazing invention.
excellent info and presentation............Hmmmmm.....is the HV cooling fan supposed to be on at start up.......should it blow "forcefully" somewhat........I have a low air "movement".
Hi sir your videos are very very helpful, i have a problem with my car i have a toyota prius 2012 when i drive slow engine stays on but the hybrid system switches off and a warning message saying, check hybrid system comes on the dashboard. Ive changed EGR valve and also hybrid battery has been checked. Please could you advise me what to do. Many thanks.
Great video but found one thing:) engine is powered on during the first start also if the hv battery is fine but just to warm up the whole hsd system and engine itself.
Completely awesome. I don't understand the thumbs down. Some people just are ungrateful b#@tches. You doing a great service to humans beings, you are sharing knowledge. Thank you sir. Much respect.
Am I able to rebuild the "alternator" in my 2004 Honda Civic Hybrid? I have purchased a brand new correct battery and need to repair the "alternator". Thank you.
Perfect guides. Thank you. Problem is charging of 12v battery. I have 1st generation, 2003 as your example. Could you please advise common reason of that malfunction. 12v battery unable to charge from IMA. I have two codes: p1600 and p1570. During idle rpm voltage of small batterry is 11V, at time of acceleration growing up to 13,0 V.
WeberAuto is there anyway to check how good battery status? My volt seems to give me different ranges almost daily basis. It’s anywhere 60-70km range... I never see 85km once? This is for generation 2 volts.
I have 2012 Honda Civic Hybrid. About 2 months ago I bought a 1 year old 12V battery, but never used, it was sitting on a shelf for about a year. It cost me $60. When tested a month ago with a battery tester it showed 100% charged and good battery. Yesterday it was dead (not charged), but battery tester did not show "bad battery", it showed 0% charged. I did not forget to turn off any electrical component to accidentally discharge the battery and I have no error codes on my dashboard. I started my car using jumpers and drove about 30 miles to work. The car was parked for about 8 hrs. and I couldn't start the car again. So anyways, the battery lasted 2 months for me. The guy gave me 12 months warranty for the 12V battery so I can return it back for money back. Yesterday I went to Autozone and bought a brand new battery specified for my car from Autozone. It cost me a little over $200 with 5 years warranty. When I measure just the cables without the 12V battery connected it reads 12.88V with engine running. When I measure the 12V battery connected with the engine running it reads 14.56V. Does this mean that the charging system for the 12V battery is working fine? I guess besides waiting for a couple of weeks to see whether the new 12V battery holds full charge there is no really other test I can do or is it? Thanks!
Hello! Thanks for the great videos. Could you advise me to where to ran an extra 0 awg cable from if I would like to do a so called big 3 upgrade as I would like to install a sound system in my Prius mk3. Where is the other end of the white cable is going from the fuse box? Many thanks
Got a question: why AGM battery is necessary? If toyota uses a normal battery, they can charge the battery more frequently, so the normal battery can also works, all they need to do is to command DC-DC charger more often. Why they need the battery discharged deep before recharge?
I do not know why they used AGM batteries. I suspect it is because they could use a small size and weight battery and have it last through the deep cycles. The fourth generation Prius uses a regular lead-acid battery although is is a European Normal (EN) size. the owner's manual states that any lead-acid battery can be used as long as it fits in the battery tray and hold down brackets.
Last time I had a regular 12 volt battery installed $148 for Interstate brand so $300 isn’t a stretch for Prius anymore. Thinking of ditching cars and just Uber around.
I have the rare 2008 Altima Hybrid (which is basically a Toytota Camry Hybrid with Nissan badges) and it has an "Emergency" starting procedure when the 12-volt battery is dead. You have to hold the Start/Stop button for 15 seconds. I'm assuming that it uses the HV battery to start the engine. Haven't had a chance to try this out yet so not sure how well this works. Also, I didn't know about the requirement to have an AGM battery, will have to take a look at what my Altima has in it, since we bought it used.
Thank you so much! Really, a very clear explanation for the 12 Volts system! I was looking for the alternator, (but now I know) we do not have any in this hybrid car.
Hi professor Kelly! Good day! My name is John. Is it safe to connect a 2000 watts power inverter to the 12v of the prius to operate some appliances? Thank you very much for the reply!
Hi, What is the discharging current of a Hybrid vehicle when sitting on turned-off position? because I have a Camry Hybrid and it takes 3A current, is it normal?
Hello, i'm not sure if you would see my message, but i have a Prius 2G, my low voltage battery is fine but if i don't turn on the car with a jump start it never shows any power signal at all, and i checked all the details i could, when the car is working there's no issue at all and even checked with an OBD if there's any error code and there's none, so i really don't know what else to check
Dear doctor ,, How i can disciminate between original and copy NiMH traction battery , taking into considiration my lexues es300h 2013 milage about 90k mile , and there are 7 blocks below 14 volts. Thanks alot
Extremely good topic as most people think they can jump start another car with their Hybrid and use any battery charger out there- big trouble!! Thank you professor for the insight into this overlooked but important subject. As with Lead Acid batteries corrosion on the POS terminals is a major problem and, with Hybrid batteries being buried in the back, will AGM batteries have the same issues?
I have not seen issues with batteries inside the vehicle. I think the more friendly environment of the interior helps keep them in good shape. Thanks for the feedback.
You're right. Not sure about the capacity of the hybrid shown here, but other small evs have a charge rate of 10-12 amps. As long as you have some extra time, (and you're not trying to start a diesel), you should still be able to get them going. Even still, if it was an emergency, think of an EV as a mobile power plant. You could still hook up the diesel and leave it on there for an hour (or hours) with no consequence. Just make sure the car is on. I'd probably disconnect before starting the diesel, though.
I have the same Snap-On charger I use but the CTEK chargers are better. I use the CTEK Multi US 7002 for my marine Optima batteries and it will pulse charge up to 7A as required and will go into maintenance storage mode and only charge as the battery voltage dictates. I use it to maintain my bass boat cranking & trolling motor batteries and I can get almost twice the life with the CTEK. I use the Midtronics (PSC-700S KIT) Power Supply/Battery Charger Kit when I'm programming. Great training video series John!!
Thanks for the video. I have had the idea for a long time, that is why there's need for the standalone 12V battery. The high voltage battery has a lot of capacity, if we have a converter, it easy to get a 12V source from it. I think it will be simpler system for manufacturers and for customers.
What you say it's a bad idea, the prius high voltage battery has 1kwhr not so much , the 12v has about 600whr, so if there was only high voltage if you god depletted (forgot the light or other acceaorry ) hou do you start the car ??? In our case we change the 12v and are ready to go .
@@andpan3478 I think there should be a way to set a limit so the high voltage battery will not get depleted, I don't mean for us, it's for the manufacturer when they designed the car. The 600 whr is too big a number, I couldn't find the exact specs for this batter, it's should be under 40 whr.
@@guangdewang1032 try again and do the math, i know wat i write , so in the prius the main bat is ~ 200v x 6.5Ahr , so 1300whr or 1.3kwhr, then the aux battery is 12v x 45Ahr = 540whr capacity (there is no way to be 40w , never , )) this is for prius but trere are cars with aux bat of 60, 80 or even 100Ahr .
@@andpan3478 I had been trying to find the specs of the prius lead acid battery, where comes the number 45Ahr, can you post a link? This number is sounds too big to me.
Hi, thanks for All your videos.... One question , on the 2007 Altima hybrid 12v battery does it comes with the temperature cable ? Or only the 2 cables? Thanks for your time and help....👌👀
Mr. Kelley, I've been in the automotive field since 08 when I graduated from U.T.I. I worked at a few Chrysler dodge jeep dealers and took their basic courses on hybrid vehicles,much of which I have forgotten over the years working in independent shops,and hybrids just were not as common as they seem to be getting now. Today I had a 2013 Lexus rx400h get assigned to me for a no start complaint. I searched high and low on all data with no success in gaining any info or description and operation on how the system works and keeps the 12v battery charged,as I didn't just wanna throw a battery in it I wanted to verify the system was operating as designed... and I remembered your videos and this is just what I needed. I can't thank you enough for putting this info on TH-cam for Free! I would love to be able to come take your classes in person,but its just to far away for me in Ga.
Thanks! I really appreciate your knowledge of these vehicles and more
Thank you very much!
@@WeberAuto i have been working on a prius with a code p0A08 is it possible to point me in right direction? 12 v charges hybrid battery in fairly good shape changed inverter pump was serious blockage flushed system l, turbulence is in reservoir, hybrid battery charges but something still triggers this code after a few minutes
@@WeberAuto your welcome, i feel like you are a cool teacher and someone id like to hang out with
@@ragestyler-mac8250 See my other video on checking and load testing the 12V charging system th-cam.com/video/_V9PiOpaxyE/w-d-xo.html
John, I tried the "no ring while working on the car" in the past but the wife wouldn't buy it!
Great video. Thanks for all the time and effort you put into your channel.
Knowledge is addictive.
LOL! Thank you!
Professor - 2013 Prius 3 owner since new (251K miles) who does most maintenance DIY. Just finished rebuilding ICE side (head gasket & other “it’s time” parts). This series opens up a whole new understanding of the hybrid side, and possibly another 250k miles 🙂. Thank you!
Thank you!
I lost your videos for a number of months, I am glad you popped up again and your honesty matches your great teaching skills, thanks for both...
Thank you
Hi Professor. Thank you so much for invaluable information. I own 2007 Prius and I have been my own mechanic since 2013 when inverter/converter unit went out. It took dealership 3 hours to troubleshoot it, cost me $318, California rates. Again dealership charge me $500 to replace low voltage battery, and finally $500 to replace burnout HID headlights. It was totally ripoff. Well, that was then. I finally figure out how to work on this vehicle now. Your information is helping filling the caps. Thank you once again for your time.
Thank you!
i love it, i hate my self for not been watching this training videos, but now im on it.
This video clears a crystal clear idea that Low voltage system has no connection with engine start or stop and it's charging. Even research papers can't explain it so clearly. Thank you.
I am glad it was helpful. Thanks for watching
Thank you so much for these videos. Our 1st Prius was a 2001 hand built in Japan we ordered on the internet. Since then, we've owned 2008 2013 and a 2018 Prime. Your postings have been so helpful in my understanding and appreciation of this astonishing engineering. You are a master teacher.
It's worth mentioning that AGM batteries have a security overflow drain pipe. We saw it in the video at 22:25. These batteries are entirely sealed and any generated gases are vented through that tube instead of inside the cabin. This is why AGM batteries are used in vehicles whose 12v battery is in the cabin.
That is very true! Thanks for the feedback!
Having your attention, I have to say how greatly I've enjoyed your videos since I discovered them earlier last week. I've been binging on them for a while now. And in this one, I have to say it's a sweet classroom setup. My auto mechanics classes in high school (in the 80s) were more... traditional.
Thank you very much! I really enjoy being an educator. Have a good day!
I appreciate this series, and I hope I am not wasting anybody's time with a personal comment. In the 1920s my grandfather owned an automotive electrical service business in Wichita Falls, Texas, and also manufactured his own line of automotive batteries. Watching this video, I could not help but wonder what Grandpa might have thought of today's technology and problems, such as not being able to get to a dead battery because it was locked in a trunk that can only be opened electrically. Please keep up the good work--I just bought a 2018 Camry Hybrid and I need all the help I can get in understanding it.
Thank you, I am glad it was helpful. Cool story about your grandfather. I am sure he would think we have lost our minds ;)
@@WeberAuto Hi John I have watched almost all your marvellous videos and was wondering if you could possibly help answer a question please. If the HV battery had been left standing for a long time like going away for 6 months, if the battery was then almost flat could I still start the vehicle using the jump start connector or would the HV battery need to be charged at a Toyota dealership.??? Many thanks for all your great work.👍👍👍
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I have a 2016 RAV4 Hybrid and I'm loving these videos. I used to do all my own maintenance when I was younger, but I rarely am able to even "converse" with someone about anything to do with my vehicle and feel out of sort anymore. You're educating me at least to the point where I can tell if a "Certified Technician" at the dealership is bull shitting me or not. I'm feeling better already. Thank you for all you do!! Jim.
Thank you very much, I am glad they are helpful to you.
This was the most helpful and informative video EVER. I had trouble with my Camry Hybrid, but no more. Thanks so much!!
I am much older than you; grew up with points and condensers. Your videos allow me an accurate, detailed, and intelligent insight into the newest technology. And, as always, a wonderful presentation. Thank you for sharing.
Thank you! I am still old enough to have worked on many vehicles with condensors and points ;) I am glad the videos are helpful.
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Mr. Kelly, thanks so much for your videos. You just helped me and taught me something from thousands of miles distance
Every second of your video is worth watching
I gathered lot of information from you which is very usefull and valuable for everyone, who has hybrid vehicle. from srilanka . 🇱🇰 Thank you professor kelly.
Thanks Sir John Kelly, YOU ARE THE BEST!
Thanks for the video! How do you think, the charge current of the auxiliary battery more than 4.2 amp after switching on the car? Have you measured it?
Yes the current goes much higher if necessary, but the battery temperature is monitored by the DC to DC converter and it will turn down the current if the battery starts to get too hot. External chargers do not monitor the battery temperature so the charge current must be limited to prevent overheating the battery.
Thank you very much indeed, for making this top quality instruction available to all that are interested. Your willingness to share your expertise in a very down to earth and modest delivery is greatly appreciated. Cheers 👍
Thank you very much!
Great video. Best I’ve seen. Helps me diagnose MKZ hybrid that Dealer has no idea what wrong. Thanks.
Mannn.... You are the perfect teacher and that's only because of a lack of words. I follow you because of this and because within my strong opinion; Your way might just be the way to teach hounest, seriouse technicians, the right way with comprehending that whih is needed in simple terms how to get this job done the right way, and it sticks. A Big... THANK YOUUUU
Thank you so much!
May God bless you greatly, your videos are a great blessing to those in need. Thank you very much for such important information provided, we appreciate it very much and I think you are the best on TH-cam, you are a great teacher. Muchas gracias...
Thanks for all the classes you provide to us. I have learned so much about the Prius(new owner)
Thank you for your information on the differences in12 volt batteries. I have a question for you, I have a 2023 Hybrid Tucson (not a Plug In)I am wanting to put the car on a trickle charge, as I am leaving the car in a garage for 6 months, but I have no battery in the engine compartment, I see a bare terminal on the inside of the fuse box, could I connect that with the positive and find a good ground, if that works do I need a special trickle charger?
Thank you great video! I have this car,and what you are teaching and sharing is greatly appreciated!
Wow looking at all these other videos talk to try electronics on the prius, they dont compare to someone knowledgeable like you! Thanks for sharing and the effort you put on the videos! It's so detailed!
Thank you very much!
Thank YOU! We need more teachers like you in this world!
Hi professor Kelly, your videos are so so good. Can't thank you enough! Keep the the content coming. I wish you many more great years working on ever growing base of electric vehicles.
Thank you!
Un Grande entre los Grandes. Un gran abrazo Profesor Kelly.
Your videos are awesome. Auto shop class was my favorite class in high school.
Glad you like them!
Sensing of batt temperature on LV battery is not for over heating safety.
AGM batts are charged to different voltage depending on temperature, and i have seen Ford car killing batts with 15,5V at summer, because of dead temp sensor. Basically the colder the higher voltage, and limit is at about 15,5V at under -10 deg C.
This systems are just correcting charge voltage to proper electro chemistry activity levels and are typical even in non hybrid start-stop engines, and in some cars without it too, even in flooded, classical batteries - it is beneficial in every case, 14,4V is really proper only in room temperatures
BTW, nowdays alternators can have digital charge controller build in with LIN connectivity to ecu and ecu can still be responsible for voltage management - poor ecu ground caused random charge voltage and charge message popping up to my client and it was actually hard to trace, as there is no way to check alternator by myself, and no errors were present anywhere
But batt temp sensor built in the battery is awful, it is ideal to be mounted in battery tray and i would prefer for it to not be in way of drainage - leaky battery kills it in volvos and fords :>
Many brands are just using outside temp and correct for known drift, its still less awful than custom battery
I enjoyed your video .. high quality presentation. Thank you so much.
Thank you!
Having 2 Chevy Volts I really like these videos and information! thank you. Dc to dc converters just like golf carts.
Thank you! My wife and I also have a Volt, we love it.
Professor Kelly as an owner of a 2008 Prius I really appreciate the information you provide in your videos.
I don't understand why the 12v Prius battery is limited to 4.2 amps charging for 10 hours when the DC to DC converter provides 150 amps continuously as required.
Many Thanks in Advance!
Jeff Erdmann
The 150 amps maximum is to provide current to the rest of the vehicle as needed, not to charge the battery.
I suspect it's more of a paper recommendation to avoid overcharging and overheating the battery damaging it. I've used AGM batteries for over 20 years in hot rods I've built and they can be charged at higher amperages for short periods of time but it is very easy to overcharge and damage them. It's not easy to ascertain the charge state and calculate the charging time on the AGM batteries. Some of the early manufactured actually had a chart which one could carefully conservatively calculate charge time using high amperages for a very fast charge. Although I don't recommend it I have successfully hit both my 2007 and 2008 Prius's with dead low voltage batteries with 20 amps while disconnected for 15 minutes for a fast charge to get going quickly with the high voltage system finishing the charge while driving the car.
Incredible detail. Thank you for this video.
Fantastic teacher. I am EE student, and have interest in automotive technology and mechanic engineering. And theese episodes are perfect.
Thank you!
Can i ask what is the purpose of theese videos, i mean i know education. But do you made it for specially for TH-cam or for your students?
Hi, I started this Channel and have made all of these videos for my automotive students. I use them in my classes and assign some of them as homework. To my surprise, other automotive programs in high schools, colleges, and universities are also using them in their classes. Professional automotive technicians, weekend mechanics, and anyone else who is curious about automotive technology are also watching them.
I also really appreciate it,thank you for your time.
Great explanation Professor. I have a question, is there a terminal good enough to take power from for let's say an 80 watt condenser fan? I live in the Middle East and in the summer the AC suffers in traffic. The car is 2019 Avalon hybrid
Thank you for your content. Quick question. Can someone disconnect the hybrid battery? Will this prevent parasitic draw on the 210 volt battery if you don't drive it for 6 month and will it still be as strong as the last time you used when you reconnect it?
Thanks for another great video, Professor Kelly!
Thank you!
Thanks for teaching and i like to tell u thatvu have a perfect wayvof explaining u r the man. Gracias por todo Maestro
If you add another 12v agm battery and connect an inverter to it to run 120v appliances do you need to have another DC to DC converter between the 2 AGM's?
Theoretically yes. The single DC-DC converter has a limited output and limited cooling abilities. See my video on testing the DC-DC converter th-cam.com/video/_V9PiOpaxyE/w-d-xo.html
Hi john superb series by the way have you any idea what type of 12v battery on a Toyota corolla touring sport 2.0 2019.....the Toyota forum that I go on are split on the awnser between AGM or normal acid type...Michael uk.
According to Toyota service it is not AGM
@@WeberAuto thanks for that, so this could be changed with any good quality 12v battery? why do you think this 2.0 hybrid corolla has a normal battery instead of a AGM...Michael uk.
@@andwelovearpsychopat7820 They don't need an AGM if it is located under the hood. Special ventilation is not required there.
@@WeberAuto according to the uk corolla forum the 2.0 Corolla touring sports hybrid has the battery in the boot/trunk
Fantastic video. Well done for the amazing work.
Professor Kelly: so the 12V battery, since it is less than 12.5 at the terminal, is due for replacement or would you suggest to the customer that it can wait a little?
It is hard to tell without further testing. See my new video on checking the 12V battery and charging system on a hybrid or electric vehicle for more information: th-cam.com/video/_V9PiOpaxyE/w-d-xo.html
Thank you very much for your speedy reply Professor Kelly, always appreciated sir!
At 34:12 you say that it steps it down by the transformer action. This is DC! No transformer action is possible. Am I right?
No, you can pulse DC and get transformer action. Think of an automotive ignition coil for your spark plugs. DC. Thanks for your feedback.
I guess Faraday's law is wrong:
van.physics.illinois.edu/qa/listing.php?id=2354
however you can CONVERT DC:
en.wikipedia.org/wiki/DC-to-DC_converter
Thanks for encouraging me to use my brain. It is so hard with age.
I appreciate you videos and learn a lot from them.
Pulsed (or modulated) DC power on the primary winding of a transformer will induce current into the secondary windings. You can step up the voltage (like an automotive ignition coil 12V to 20,000V) or you can step down the voltage (like in the high current DC-to-DC converters of a hybrid or electric vehicle 201V to 14.5V). Faraday's law describes a changing magnetic field, it does not have to be changed by AC power. The next video I will publish this weekend is on inverters and converters. You will be able to see the center-tap transformers quite clearly. Your article on Faraday's law was based upon a steady state DC, not modulated. Your wikipedia article, section 3.1 clearly states "In these DC-to-DC converters, energy is periodically stored within and released from a magnetic field in an inductor or a transformer". I hope that helps.
Thank you so much for the explanation.
Drove our OEM 2009 Prius for ten years before replacing the engine battery, (not hybrid) before any issues.
I used TH-cam to replace myself and although it is located over the right rear wheel and was a challenge
to lift and replace, it is possible without a engineering degree to replace! Great information here, thx!
I hope will have a test on the new Electric Kona 2019.... is the battery cool like the bolt...or the leaf ?
Me too, I do not know yet
Yes, all Hybrid vehicle also don’t know this happen. I also happen on my Mini Countryman SE Hybrid for checking DC control in BMW.
Thanks for your feedback
Which generation Priuses need that special battery? My daughter has a gen-1 and I believe it has a standard lead-acid 12V battery. We bought the car used, but it gets regular service at a Toyota dealership.
The first three generation Prius' have AGM batteries. They must be vented externally. Standard lead-acid batteries are not safe due to not being vented to the outside of the car. They area more likely to spill electrolyte inside the car in an accident as well.
6:27 If you need a jump-start from another vehicle, are there any caveats a Prius owner should know?
They may call it auxiliary but it's essential. It makes some sense to me still have a low voltage battery, it allows the DC to DC converter to be sized slightly above the average power consumption. If there wasn't a battery, the DC to DC converter would have to be able to power all the headlights, the rear defroster, the horn, etc at the same time.
Very true, thanks for your feedback!
I have a 2016 F150 2.7 and I think it has a battery temp sensor on the positive battery cable.
Yes, the temperature sensor is used to fine tune the high current charging system. If the battery gets too hot, the charge rate gets turned down. Thanks for your feedback!
Thank you for giving me information I can use even though I don't have a hybrid. That's why I love your videos.
Is there any way to raise the voltage im doing a car audio build than the lithium’s would work better at 15v but my Prius only does 14.1 I saw on another video the converter under the hybrid synergy drive is what puts out the 14.1 I have the Prius c so my guess is I wouldn’t have any luck but figured I’d ask anyways
Not that I know of.
@@WeberAuto darn true ima just have to put a lot of hell batteries in it because the voltage drops quick on the led acids
The Chevy Volt ICE will run whenever the hood is open and power button is on. I think is for maintenance.
Yes, it is for maintenance reasons (Oil changes, diagnostics, emissions testing, etc.) Thank you for your feedback!
That would be for safety. You are less likely to put your hand on a spot that is already moving. Smart thinking GM.
Can we jump start an AGM battery on a hybrid vehicle with a traditional lead acid battery ?
yes
so you can`t use a normal charger to charge the 12V battery but can you use one under the bonnet to start car or unlock the boot/trunk?
True, but only under the hood long enough to get the engine started. Thank you for your feedback!
How do you use the AGM charger at the fuse box to charge the auxiliary battery? You were going to explain it in this video, but you didn’t come back to it. I was unable to locate that.
Thank you for your help!
Did you get an answer on that?
do you have any teachings on Tesla ??
Not yet, hopefully later this year
Thanks , Tesla is way ahead as far as tech goes I'm guessing
We will see if that is true
I think you should rent one to check it out..... :)
Professor how do the engine charge the high voltage batteries without alternator? I mean what component is used to charge the high voltage batteries?
the DC-to-DC converter charges the 12V battery
And the high voltage batteries?
Ahmed Zulfe The engine spins the shaft on a 3 phase brushless motor. This makes the brushless motor act as an AC generator. This is rectified and regulated to charge the high voltage pack. It is also possible for the drive wheels to drive the same shaft (as they are all 3 connected through an epicyclic gear set). In that situation the momentum of the car charges the high voltage pack. This happens during regenerative braking. Other times electrical power is applied to this motor to drive the wheels of the car or to start the engine. This one motor is not just a drive motor but also replaces the starter and alternator. Toyota’s Power Split Device transmission (they call Hybrid Synergy Drive) is truly an amazing invention.
23:36 Snap-On Tool model # for trickle charge for this Prius
Hi Professor Kelly I have a 2005 Toyota Prius hybrid got new battery it started but when tune off can’t tune back on..
Jump starting from the Stud Nut is also my preferred location. However, Nipples and Stud Clamps are often overlooked
Thank for all the great video there is alot of good information to help diagnose electrical probleme on car.
Thank you!
excellent info and presentation............Hmmmmm.....is the HV cooling fan supposed to be on at start up.......should it blow "forcefully" somewhat........I have a low air "movement".
question, what does the starter generator does on a GM hybrid? dont the generator charge the HV batterie?
Hi sir your videos are very very helpful, i have a problem with my car i have a toyota prius 2012 when i drive slow engine stays on but the hybrid system switches off and a warning message saying, check hybrid system comes on the dashboard. Ive changed EGR valve and also hybrid battery has been checked. Please could you advise me what to do. Many thanks.
Thank you John . I love your tutorials .
Great video but found one thing:) engine is powered on during the first start also if the hv battery is fine but just to warm up the whole hsd system and engine itself.
Completely awesome. I don't understand the thumbs down. Some people just are ungrateful b#@tches. You doing a great service to humans beings, you are sharing knowledge. Thank you sir. Much respect.
Thank you very much. i do not understand either.
Am I able to rebuild the "alternator" in my 2004 Honda Civic Hybrid? I have purchased a brand new correct battery and need to repair the "alternator". Thank you.
Perfect guides. Thank you.
Problem is charging of 12v battery. I have 1st generation, 2003 as your example.
Could you please advise common reason of that malfunction.
12v battery unable to charge from IMA.
I have two codes: p1600 and p1570.
During idle rpm voltage of small batterry is 11V, at time of acceleration growing up to 13,0 V.
is it better to charge your car using level 1 for longer battery life? Assume the faster charger may degrade battery overtime?
Yes, level 1 chargers will not degrade the battery as soon as level 2 chargers.
WeberAuto is there anyway to check how good battery status? My volt seems to give me different ranges almost daily basis. It’s anywhere 60-70km range... I never see 85km once? This is for generation 2 volts.
So the black wire from the trunk that is white in the underhood fuse box is the dc to dc step down power to charge auxiliary or regular battery?
I have 2012 Honda Civic Hybrid. About 2 months ago I bought a 1 year old 12V battery, but never used, it was sitting on a shelf for about a year. It cost me $60. When tested a month ago with a battery tester it showed 100% charged and good battery. Yesterday it was dead (not charged), but battery tester did not show "bad battery", it showed 0% charged. I did not forget to turn off any electrical component to accidentally discharge the battery and I have no error codes on my dashboard. I started my car using jumpers and drove about 30 miles to work. The car was parked for about 8 hrs. and I couldn't start the car again. So anyways, the battery lasted 2 months for me. The guy gave me 12 months warranty for the 12V battery so I can return it back for money back.
Yesterday I went to Autozone and bought a brand new battery specified for my car from Autozone. It cost me a little over $200 with 5 years warranty. When I measure just the cables without the 12V battery connected it reads 12.88V with engine running. When I measure the 12V battery connected with the engine running it reads 14.56V. Does this mean that the charging system for the 12V battery is working fine? I guess besides waiting for a couple of weeks to see whether the new 12V battery holds full charge there is no really other test I can do or is it? Thanks!
Can I replace my small-size Prius battery with the normal-size battery that all the other Gen 2 Priuses have? Mine's an 05, non-smart key battery.
You can but not recommended
Hello! Thanks for the great videos. Could you advise me to where to ran an extra 0 awg cable from if I would like to do a so called big 3 upgrade as I would like to install a sound system in my Prius mk3. Where is the other end of the white cable is going from the fuse box? Many thanks
Thank you Sir. Very good class here.
Very good explanation. A dream for us to study one day in this university.
Got a question: why AGM battery is necessary? If toyota uses a normal battery, they can charge the battery more frequently, so the normal battery can also works, all they need to do is to command DC-DC charger more often. Why they need the battery discharged deep before recharge?
I do not know why they used AGM batteries. I suspect it is because they could use a small size and weight battery and have it last through the deep cycles. The fourth generation Prius uses a regular lead-acid battery although is is a European Normal (EN) size. the owner's manual states that any lead-acid battery can be used as long as it fits in the battery tray and hold down brackets.
Thanks you.
thank you Mr Kelly for a great work I am experiencing a low voltage on my honda vezel 2017 12 volt battrey please advise me accordinly
Last time I had a regular 12 volt battery installed $148 for Interstate brand so $300 isn’t a stretch for Prius anymore. Thinking of ditching cars and just Uber around.
Thanks for your feedback
Still $306 Toyota prius 2016 and we have $50 discount cause I bought my old battery back so yes 👍 still $306 here in California
And is 2020, probably the price change depends were you live
Is there an accessory mode? Like listening to the radio at a drive-in theater for 2-3 hours.
I have the rare 2008 Altima Hybrid (which is basically a Toytota Camry Hybrid with Nissan badges) and it has an "Emergency" starting procedure when the 12-volt battery is dead. You have to hold the Start/Stop button for 15 seconds. I'm assuming that it uses the HV battery to start the engine. Haven't had a chance to try this out yet so not sure how well this works.
Also, I didn't know about the requirement to have an AGM battery, will have to take a look at what my Altima has in it, since we bought it used.
Thanks for your feedback. You are correct, the HV battery is used to power a motor in the transaxle to start the engine.
@@WeberAuto
Do the 2nd Generation of Prius (2007), also have an "Emergency" starting procedure? Naz.
I have trouble with 08 Camry hybrid starting. Accessories are good and 12 v good. Any solution?
do you have online training course ??
Thank you so much! Really, a very clear explanation for the 12 Volts system! I was looking for the alternator, (but now I know) we do not have any in this hybrid car.
Glad to hear
Hi professor Kelly! Good day! My name is John. Is it safe to connect a 2000 watts power inverter to the 12v of the prius to operate some appliances? Thank you very much for the reply!
Hi if some of these vehicle have special temparature sonsor ,so its mean i cant replace Acid battery 12 volt ?
Hi, What is the discharging current of a Hybrid vehicle when sitting on turned-off position? because I have a Camry Hybrid and it takes 3A current, is it normal?
No, 3A is very high. 25mA would be normal
hi from mauritius...i have a japanese honda insight 2021 ze4..it has an agm battery and is sitting at 12.3V in the morning. is it ok??
Ty Professor John Kelly.
A+ video
Hello, i'm not sure if you would see my message, but i have a Prius 2G, my low voltage battery is fine but if i don't turn on the car with a jump start it never shows any power signal at all, and i checked all the details i could, when the car is working there's no issue at all and even checked with an OBD if there's any error code and there's none, so i really don't know what else to check
Check all the fuses you can find. There is one at the battery positive cable too
Very good thankiyou so much appreciated..very good video to help understand everything.. thanks again
Dear doctor ,,
How i can disciminate between original and copy NiMH traction battery , taking into considiration my lexues es300h 2013 milage about 90k mile , and there are 7 blocks below 14 volts.
Thanks alot
Thanks Professor Kelly. Regards, Ramish.
Thank you
Extremely good topic as most people think they can jump start another car with their Hybrid and use any battery charger out there- big trouble!! Thank you professor for the insight into this overlooked but important subject. As with Lead Acid batteries corrosion on the POS terminals is a major problem and, with Hybrid batteries being buried in the back, will AGM batteries have the same issues?
I have not seen issues with batteries inside the vehicle. I think the more friendly environment of the interior helps keep them in good shape. Thanks for the feedback.
You're right. Not sure about the capacity of the hybrid shown here, but other small evs have a charge rate of 10-12 amps. As long as you have some extra time, (and you're not trying to start a diesel), you should still be able to get them going. Even still, if it was an emergency, think of an EV as a mobile power plant. You could still hook up the diesel and leave it on there for an hour (or hours) with no consequence. Just make sure the car is on. I'd probably disconnect before starting the diesel, though.
I have the same Snap-On charger I use but the CTEK chargers are better. I use the CTEK Multi US 7002 for my marine Optima batteries and it will pulse charge up to 7A as required and will go into maintenance storage mode and only charge as the battery voltage dictates. I use it to maintain my bass boat cranking & trolling motor batteries and I can get almost twice the life with the CTEK. I use the Midtronics (PSC-700S KIT) Power Supply/Battery Charger Kit when I'm programming. Great training video series John!!
Thank you, and thanks for the charger and power supply feedback. We also use the Midtronics products.
Thanks for the video. I have had the idea for a long time, that is why there's need for the standalone 12V battery. The high voltage battery has a lot of capacity, if we have a converter, it easy to get a 12V source from it. I think it will be simpler system for manufacturers and for customers.
Thank you! Good idea. Someone in a comment on this video said that the new Kia and Hyundai hybrids are doing that.
What you say it's a bad idea, the prius high voltage battery has 1kwhr not so much , the 12v has about 600whr, so if there was only high voltage if you god depletted (forgot the light or other acceaorry ) hou do you start the car ??? In our case we change the 12v and are ready to go .
@@andpan3478 I think there should be a way to set a limit so the high voltage battery will not get depleted, I don't mean for us, it's for the manufacturer when they designed the car. The 600 whr is too big a number, I couldn't find the exact specs for this batter, it's should be under 40 whr.
@@guangdewang1032 try again and do the math, i know wat i write , so in the prius the main bat is ~ 200v x 6.5Ahr , so 1300whr or 1.3kwhr, then the aux battery is 12v x 45Ahr = 540whr capacity (there is no way to be 40w , never , )) this is for prius but trere are cars with aux bat of 60, 80 or even 100Ahr .
@@andpan3478 I had been trying to find the specs of the prius lead acid battery, where comes the number 45Ahr, can you post a link? This number is sounds too big to me.
Hi, thanks for All your videos.... One question , on the 2007 Altima hybrid 12v battery does it comes with the temperature cable ? Or only the 2 cables? Thanks for your time and help....👌👀
I do not know. If it is mounted in the truck area, it probably has a temperature sensor and vent tube
What if voltage to aux. battery is 17.3? Bad dc/dc converter? Replaceable?
Thanks for these videos