How to Replace a Car Battery and Keep the Computer's Memory
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- เผยแพร่เมื่อ 13 ส.ค. 2021
- This is a video tutorial on how to change out a 12 Volt battery on any modern automobile including Tesla and other electrics. This applies to pretty much every car made after 2014 or so. With today's modern computer controlled cars there is a special way to change a battery. A once easy repair now made just a little harder. But I am showing you exactly how to replace that battery and save you all kinds of money!
Also DO NOT start the vehicle with just the jump pack attached.
Reset Battery Monitor Video: • How to Reset the Batte...
Jump Pack: amzn.to/3AxLaGK
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If you have a car question ask it completely free at www.2carpros.com/questions/new
*Disclaimer: Please use all safety precautions - ยานยนต์และพาหนะ
Thanks buddy, had some wonky strange error codes on wife’s 2019 Tiguan and slow starts. Did some digging and learned that changing the battery could cause lots of other memory, key, code, various issues. Did your trick and it worked GREAT and various low voltage codes went away. Keeping the alligator clips on the terminal cables was difficult.
Thanks for the info, DIYers appreciate people like yourself
Thanks for watching!
Replaced the battery in a 2019 Mazda 3. I hooked up a small one amp Century charger which provides approximately 13.5 V to the negative and positive terminal lines before disconnecting the battery. Had battery out for about 10 minutes while I cleaned the posts and took my time. Zero problems and worked like a charm. No settings lost. I returned the Memory Saver unused as I read they are quirky after buying it.
I'm assuming you had to leave the charger connected while attaching the terminals to the new battery until tightened down. I have an 8amp charger and had the same idea.
mister, you're a genius obviously, but I've always been leary of doing this, supplying it AC poower instead of DC - it makes me nervous it is going to fry something
Nice video work, good “how too” instruction covering all the key points.
On most cars, the cig lighter socket is dead when the key is off, so powering there won't help, and you don't want to turn the key ON, because that will draw more current than the low current mode can supply. OTOH, it was nice to see that M-B provided a nice + terminal for this exact purpose.
As long as you don't try to start it it is fine. Thanks for watching!
Well , I ended up hooking up normal jumping cables to a running car , then switched the battery keeping the terminals still connected , it worked like perfect
By far the best video on how to change a car battery with an external power source.
Thanks for watching!
Hello! Will this be the same process for a 2021 toyota highlander xle battery replacement? @@2carpros
Really great instructions you gave. I thought they where pretty through ! Thanks very much !
Thanks for watching!
Good morning sir, sorry for my English (I’m from Italy).
Images are very clear during all the video.
Your English is very clear: I could understand everything even though my comprehension level is medium.
Each part is easily visible.
I’m not very confident with car fixing, but this video seems to be very clear.
So I will buy a power supplier before change the battery and next time I will try to follow your instructions instead of taking my car to a garage.
Thank you.
Alessandro io l'Italiano lo capisco. Prima di tutto non tutte le auto puoi mettere il cosidetto "battery saver" dove accendi le sigarette. Sulla mia Lexus devo attacarmi direttamente sull'apposito OBD attacco, altrimenti non funziona e perdi tutte le memorie varie del computer, radio, posizione sedili, ari condizionata e cosi via. Ci sono tante altre vetture come la mia, se leggi i manuale della vettura ti dice cosa devi fare. Buona giornata e attento a come l fai. Un'altra cosa che questo ragazzo si e' dimenticato di FARE e' d pulire con un apposito atrezzo dentro il MORSETTO di tutti due attacchi che va' sulla batteria. Spero che mi hai capito. Buona giornata. n.b....il tuo inglese e' molto buono.
Your written English is excellent Alessandro - good punctuation. Keep up the good work and stay humble. Ciao.
Excellent video. Thank you,
Awesome video you're saving me over 100 dollars brother 🤙
No problem 👍 Happy to help!
Idle resetting after battery disconnection, Mitsubishi iO Pajero
To fix this you have to reset the idle as follows: If cold, start car and take up to normal temp. Switch the ignition key to "lock" (OFF) for 10 seconds. Start engine and leave to idle on throttle for 10 minutes. Turn off and immediately restart with air con on, fan on full and windows down; run for further 10 minutes. Again turn off and immediately restart with air con on, fan on full and windows down, run for 10 minutes. Your idle is now reset.
Jack, the Japan Alps Brit
Loved the video, Many thanks.
A couple of things. It's a huge issue with the 2007 Lexus LS460. If you change the battery in a 2007 Lexus LS460 without using a Memory Saver/Battery Saver you will likely end up getting the following message on your navigation screen. A program cannot be read. Please consult to a dealer. When this happen you have no option but to engage the dealer. Also, if you use the cigarette lighter option you risk loosing power to your car's computer if the cigarette lighter outlet has a timeout feature. I would strongly discourage using this option unless you are ABSOLUTELY sure your vehicle's 12 volt cigarette outlet does NOT timeout.
Totally agree with you bro. My Lexus has NO power at the cigarette lighter socket unless the ignition power is on. Therefore you cannot use the battery saver, only option is to connect it to the OBD plug, this way you're ok. Cheers
You can still connect directly to the battery leads. Just need to be careful that they don't get knocked off during the change over.
Many cars lighter socket won't work unless ACC or Ignition is on which is definitely an issue for this procedure.
My 2021 Mazda has a time out feature but that's around 30 minutes so plenty of time to get this job done.@@caddyrack
😊
Thanks for the helpful tips.
Most modern cars disconnect the cigar lighter socket when the ignition key is switched off so unless you leave it switched on this route will not work.
If using the cigarette lighter socket, be sure to turn key to accessory or to the on position, as most are not powered with the key off. Electrons can't get out if not switched.
How will you know if you're running off the battery or the aux pack?
I imagine you'd be running off both until the main battery is removed, just as though you were jump starting.
For anyone reading this be very cautious as ACC mode may draw more amps than the lighter is designed for. Unlikely but be sure to turn off radio and anything else possible before hand
I was always told to change battery with key on voltage spike could damage sensitive components
I didn't have the Radio Code for my Toyota, and (by removing the Car battery) you would lose this! At the time, I didn't figure on the Cars' ECU and potential Memory Loss. But here is how I replaced the Car Battery - without any losses to the radio or ECU. The Cigar Lighter Socket was permanently 'live' with the Ignition turned-off. So I set-up a 12V (regulated) 1-Amp DC Supply which was fed from the mains by an Extension Cord. I wired a Cigar Lighter Plug to the 12V / 1A DC regulated supply - remembering the correct polarity. I then plugged this into the Cigar Lighter Socket, and proceeded to change the useless Car Battery, and replace this with new. I had never seen any videos, or even knew how to do this. But everything worked out just fine. With the new Car Battery Connected, I just simply removed the Cigar Lighter Plug from the Socket. Hope that this helps others.
Thank you for the info
Awesome videos for modern cars. bring back (1931 ford model A ) something i can work on.
Haha I've got a 1967 Camaro that makes an appearance every once in a while. Thanks for watching!
I kept my computers memory by using a solar battery charger placed on the dash board. Disconnecting the battery and leaving the charger plugged into he cig lighter kept the computer with enough power so it didn't lose it's memory during the battery removal.
In Japanese carsand may others, the 12 volt convenience outlet may be controlled by a relay that is energized by the 12V battery which means that to be safe you should connect the keep-alive replacement directly to the battery cable terminals,
So even if you supply 12v through the OBD II port, the computer may still lose memory?
I have a Toyota Hybrid 2019 and it's time to replace the battery soon, so I was thinking whether to connect the jump box directly to the battery cables or to the OBD II port if I have a special adapter.
Knowing some cigarette lighters are ignition feed this trick will be useless on some cars. There was an adaptor that fit in the lighter and had a 9 volt battery on the other end.
Been doing something similar with jump leads for years mostly to save the stereo if I did not have the codes for it.
Outrageous that companies building cars that need the dealer to reprogam after changing or unhooking battery. Thats why I keep my 2008 and 2012 Honda.
My jump pack came with an OBDIi connector. That works even if the lighter port is switched. I also noticed that you didn't clean the battery cables before attaching the new battery. Always clean the cable ends and the battery posts before you connect them. Modern cars are very voltage sensitive and you want a good, clean connection. You can get a wire brush terminal cleaner for less than $5 that makes the job easy.
Great observation for cleaning the terminals, I worked for AAA battery service and took it one step more with brushing some baking soda water on the terminals and battery box, then flushing with water. Also coated the treads of the terminal bolts with oil which can be easily found on the oil dip stick. ( Also I have used a 9 volt battery with adapter plugged into the 12 volt port and that seemed to work, saved me from buying a jump pack )
Yes a lot of cars have switched lighter/ accessory ports making the plug in battery backup useless.
Very true, one needs to be aware of that switched accessory port if attempting to maintain voltage. I guess the crux here is that 9 volt DC will maintain voltage when disconnecting main battery. @@tombanes
My 1999 Nissan Maxima 3 litre V6 has a anti theft system to the radio/cd. So if the battery is removed it needs to be re-set with the code to get the radio going. They way round it is to have a 12 volt supply available in place of the battery, so a battery jump start set, a similar battery or even the 12 volts DC from your model railway control. This is because it is a fiddle to re-set the code!
My garage has always used the bridging system if the battery has to be removed.
Thanks Jim’s Garage!
Hello. As one other person has asked: What is the connection at the other end of the spliced-in alligator clips and where does it connect to on the jump pack?
I have found some battery terminals are smaller in diameter, so the clamps can’t be tightened properly, in which case I made a metal split sleeve. 15mm copper plumbing pipe works well.
EXCELLENT video new subscriber
Wow thank you for the sub! :)
Just attach terminals before removing battery to a second vehicle with jumper cables and replace the battery. Always use gloves and eye protection playing with batteries.
Thanks for the info. One important action would be to reset/reprogram the battery management system for those vehicles having one. A requirement to avoid battery damage and prolonging life of new battery.
How can this be done?
@Lmlc24 From what I've seen, it requires an OBD II Port scanner that allows battery adaptation settings/adjustments. As for how much that OBD II Scanner cost No idea depends on what scanner you purchase. Wish I knew this before I try secretly replacing my 80 year old neighbors battery on her 2017 VW Tiguan TSi. She's on a very tight income and I told her it just needs a full charge.. trying to help her without her knowing.
@@eddiej.2354 thank for the replying I do appreciate it, I have a 2013 RAM 1500 and I purchase an AGM Optima yellow top 8 months ago and went down little by little to the point that it can barely start the truck, it was same group (H7) from previous but previous battery was a flooded battery, I don’t know if this had to be done like letting the computer know that now has a different type of battery but it’s the first time that I purchase a battery and it last only months, fortunately I was covered with warranty and they gave me a new one but I wonder if I must do this in case the truck is suitable to do so???
I have found nothing about it on the media yet!
I did this on a couple of my Ford Fusions (I have 3, have owned 4 and have 6 Fords currently) when I switched the batteries to larger CCA + AGM batteries. Used my OBDLinkMX+ adapter and a laptop running a program called Forscan. Went in to the battery settings and modified the Module AS-Built Data Values to the corresponding Group Size/Case, CCA, Ah, of the new battery which adjusted the system to charge at that rate instead of the lower preset charge rates of the much smaller OEM flooded lead-acid battery that came in the vehicle. The OBDII adapter sells for approx. $140 but can be found on sale for $100. Works with iPhone, Android and Windows but a laptop program will be needed to change AS-Data Module values.
That being said I have a 2004 F150 Lariat SuperCrew that I did a like for like (same CA, CCA, Group Size) battery swap except from a flooded lead-acid to AGM and made no changes via OBDII and have had no issues with proper charging since doing so.
Turtle from Entourage! Thanks Bruv!! running to swap out my Batt
Not sure if that's a good thing or bad? No problem! Thanks for watching!
I use my OBD port with my jump box. I have a 2017 Kia Sportage.
Terrific video and thanks! To confirm: To replace the battery, one has to follow use THIS video's procedure, to preserve the ECM, and then step 2: Reset the Battery Mgmt System using your other video. Right or is there a 3rd or 4th step which I'm omitting? Will the other video be applicable to a Kia Seltos?
If one doesn't want to spring $100 for a jump box, what would a typical mechanic charge (labor) to replace an AGM battery brought to him (or her?) by the customer?
Thank you I just did mine with no issues.
Nice work! Thanks for watching!
Great video. I have a 2020 vw gli needs a battery should i try this? Not wanting to spend 500
One thing if you use the acc outlet to power up the car to keep the computer going make sure that the cigarette lighter has voltage it doesn't have a blown fuse. And everything is turn off.
That fake cigarette socket on that mercedes is a dust cover😂😂 Its an optional extra
Would it be the apporiate time at this point to spray on a anti-corrugation agent on the battery terminals?
I can say I have had no issue changing my battery on my 2011 Tucson. It does not care if the power is disconnected other than losing the radio presets on the xm radio.
Hi! Can I use one of these when connecting my multimeter in series with the battery terminal to test for parasitic current drain or would it mess up the readings?
I have the same Noco jump box. I also have the cigarette lighter cable, but it only plugs into the POWER IN port to charge the box. How did you set it up for POWER OUT?
All that is required to protect the computer’s memory is 9 volts. Parts stores sell $10 kits consisting of a 9 volt battery attached to a cigarette socket plug. Cheap and effective. Don’t forget to clean your terminals.
Same but mine plugs into obd port under driver side dash👍👍
I used a 9V battery to power the computer thru the cigarette port when changing out the battery. When I was done, that 9V battery was burn your fingers HOT! It worked though.
So now I have to pay Jeff Bezos a $100 for a battery pack, just so I can replace my $150 battery? I hate these electronic monsters.
No, Terry, just use jump leads from any other car battery, possibly in another car. And if you follow the strategy I posted today, you can choose when to do it.
How did you splice the wires into the novo charger?
Did you gingerly hook up 2 jumper box's?? 😊
Good job
Thanks!
You used car sig litter than u used the neg positive terminal by the battery. Is it either one sig lighter or neg pos terminal on battery ? Thanks
I purchased the NOCO Boost HD and the connector cable that connects to the power out from the booster has a male and female connector on it. The power out from the booster requires the male end of the cable. The adaptor that plugs into the cigarettes lighter/ auxiliary power port adaptor has male connector and so does the remaining cable end. Is there a auxiliary power adaptor the has a male input?
@2carpros Is it the same process for a 2021 toyota highlander xle?
When you turn on gb70 should I also turn on to the accessories mode my 2017 honda pilot?
Hi, Sir.
After I replaced my 2020 Lexus RX 350 battery and the dashboard on the right side shows a (car/off) and a (P””/off).
Would you please help and share your expertise how to fixed.
Thanks in advance and I am a huge fan of your.
Paul H
So, can you use a low amperage battery tender on the battery clamps?
Where could I get the part you connect into the cigarette port
I wonder if some have diode protection on the lighter socket so current wont go in?
CHECK OUT THAT YOU HAVE POWER IN THE CIGAR LIGHTER WHEN THE ENGINE IS OFF
Will it be the same process for a 2021 toyota highlander xle?
@2CarPros So, considering de-powering a vehicle's electrical system (by turning the vehicle off and disconnecting the battery) is the first step to perform most electrical system repairs, how does one cut the power to the entire electrical system without cutting power to the on-board computer?
(Could be the subject of at least one TH-cam video, huh?)
I have a Kia EV6 and going overseas for 6 weeks. Should the 12v battery be disconnected from the high voltage battery while away? I plan to trickle charge the high voltage battery on a timer to result in a 80% charge when I return. If I disconnect the 12v battery I could end up with the issues you discuss here. Would the 12v battery keep getting charged by the high voltage battery if it get the trickle charge?
I use a accessory plug with a 9 v battery attached plug it in to a accessory port works just fine
It's no huge problem. 🤣
If you got an OB11 you can change it over without any drama. Alternatively, you can get road side assistance yo change it over with a new one. Thry also recode it for you.
I might be wrong but if you just change battery while the system is on (engine running) you can keep computer memory easy without additional equipment.
Would not recommended doing this. Thanks for watching!
Do you recommend any specific auxiliary power port adapters for the jumper? It doesn’t look like the amazon link includes the adapter to the cigarette port? Also was hoping to possibly purchase just the adapter to fit my topvision jumper.
No, anyone should work just splice it in. It just need to provide a tiny amount of power to the system. Thanks for watching!
Hey thanks for the informative video! Just wondering, would I be able to use a regular charger or a trickle charger instead of the jump pack?
Yep! Thanks for watching!
Use a trickle charger. Works great. Keeps all the memory info intact.
Why don't you tell users ,what you do with the other ends of the alligator clips?
Yeah..I didn't understand that. Where did the other end of alligator clips connected to?
Did you make cigarette lighter cable? I have one of those jump device. Always lose memory when I mess with battery.
thanks for doing this on a car that almost everybody owns, a Mercedes-Benz....😂😂🤣
what if you change from a lead acid to a AGM battery . Just got a car that the old owner changed to AGM battery and also changed the alternator. The voltage goes to 14.5 at start up then after some miles it drops to 13.1 and if I turn on the lights it goes to 12.9 or .8 If I shut off the engine and restart it starts at 14.5 again and the process continues. The old owner just put a trickle charger every night . I did die on his wife once after 2 days and several hundred miles . I have only put on about 130 and have not charged yet. will this reset help and is there a reset for changing the alt?
thanks for the video. can i use this kind of device to keep my baiid device powered on while changing parts such as a starter, alternator or any other electrical device on my truck, or does this send power to all those other things also? rendering my maintenance just as dangerous as having the battery connected?
The information in this video is not accurate. If you need to work on your truck, just disconnect the battery. Nothing bad will happen. If you read my other post, I go into a bit more detail.
I have a 07 Fiesta so it seems I can have no complications ,am Iright?
spliced in the red and black wires where? attached to the charger alligator clips??
Sometimes those boosters put out over 15 volts fully charged under a light load. Is that OK?
Had my battery replaced at a small roadside shop and they just did it with the engine running. No need for any extra equipment.
Why, if you are connecting another 12v to the car, does it not blow the system as you are now putting 24v through it?
Hi 2CarPros. I have had this computer problem with Subaru’s MY2007 2.5ltr 10speed manual is a bitch to drive (stalls at every intersection) if you have disconnected the engine management computer.
It does re-tune step by step over a week or two!
Ans; I made two light duty jumper leads with a small lamp 10>20W, connect to any P/S, if you F/Up the lamp lights up . How simple is that! LesC.
Isn't cigarette lighter port for output only?
How can you feed with voltage from the cigaret port when the battery is removed? Where is the power bank?
My jump starter has USB QC output. Says 12V at 1.5 A on it. Is that enough power for this method? Also wondering if this method can be used to keep supplying power to the ECU for basic OBD2 code reading without turning the engine over. OBD2 readers tend to draw power, so I'm always worried that I'll flatten the battery if I keep reader connected for too long.
You don’t have to start your vehicle to read code’s throughout the OBD port. But you do have to wake the ECU and other modules up by turning the key on without starting the engine if you want to read stored codes. That will take more than 1.5 amps so, no, it won’t work.
All that 1.5amp port is good for is to provide enough keep-alive power to the ECU while it is OFF to keep its memory from loosing its contents as it might otherwise while changing out the 12v car battery.
New subscriber here, I have a question sir, how about if we do weld in any metal part of our car, can we apply this method? or we totaly remove the electric supply to avoid damaged of accessories?
I would completely remove the battery to be safe. Thanks for watching!
Welding on metal(grounded) frame and attached parts would not normally affect voltage circuits, but high currents could be induced in nearby sensitive wires. In my opinion, the most risky scenario would be to take the battery out and leaving the positive and negative battery cables open-thus subject to high voltages being developed between the positive and negative circuits. The next safest would be to have a low impedance 12v battery clamping/limiting the induced voltage. The best case, although causing the memory data to be lost, would be to short the positive and negative cables together, after some time to allow for decay of existing charge, so high voltage would not be induced by welding.
starting in 2022 Tesla replaced all of their 12 volt lead acid batteries (you won't e able to find one in the car). The replacement was a newly designed lithium 16 volt battery that is permanently installed. The design of the new battery is the same as the power batteries and should last the life of the car.
I think some cars even as far back 10 years plus lose functions even if its just the car radio which often need a code to enable them again.
Mercedes GLA250's are some of the most beautiful piece of shit cars in the world. Even simple procedures like removing batteries require light surgery, especially when parts seize. 10/10 dont recommend buying one anymore.
😂😂😂 amen
This takes about 30 minutes. Quite easy frankly
@artagain8977 Simple but not "easy." There are too many loose parts to account for when removing a battery. Also, they're not reliable in sub-zero weather, like advertised. For instance, removing a battery in -20 weather is a chore. What if there was an emergency? On most cars, the battery cable is in plain sight, not covered in hard plastic. Also, trying to boost these things at the charging connectors is futile sometimes and often still requires one to connect directly to the battery. The reason I bring up -20 weather is that those inconveniences can also cause one to freeze their gas lines in a matter of seconds.
All modern shit boxes have this. 🤣
Actually, other cars have the same problem. I have a 2009 Scion xB and it needs a constant voltage to keep the computers and radio settings in tact. I've used a simple device that plugs into the n12 volt port (formerly cigarette lighter) with a 9 volt battery attached. 9 volts are enough to keep this system alive.
I think some cars have to have the key in the on position for the cigarette lighter/auxiliary plug to work. Does the key need to be in the on position to supply voltage to the computer in your scenario? Thanks.
My 2020 Acadia does not have power to the Cigarette lighter socket with ignition off or on acc.
Interestingly my 2020 VW ev (ID.3) had no problem with a regular battery out, battery in swap.
Your workaround is something that I did consider though.
Batteries generate an explosive gas, so sparking could cause an explosion giving the installer a face full of acid. Eye protection strongly suggested.
Sorry to ask where does the other end of the alligator wire go? I see 2 wires, one end to positive and negative to the car, and other end just leave hanging? Please help clarify. Thanks.
+ to + (red), and - to - (black, and in this case (as usual) connected to the car body.)
09:38 - I'm a little confused. Why would the negative terminal create a spark when being reattached and if it does, should we _not_ continue with the battery install? Thanks
A draw can cause the battery to ark or spark when reconnected. Then those sparks can ignite the gasses off the battery and explode. Can be dangerous. Thanks for watching!
If you did not have a booster pack, could you jump from another automobile?
Thank god. Now i don't have to re program my stereo.
Of course car mfrs have to design for the case of no-power because a battery my die unexpectedly at any time. Also, re the cigarette lighter / power port, can these typically supply power in both directions? As a cig lighter it is designed to supply power out. Now, you are assuming it can also accept power in? Hopefully the car's user manual will cover this situation.
Of course power can flow in or out of a cigar lighter. I keep a battery tender plugged into a cigar lighter in my Ford V10 motorhome during storage, Works great. I even have a plug in DC digital voltmeter plugged into another cigar lighter so I can monitor the charging volts and also the battery volts when not using the tender.
All examples of cigarette lighter port producing output, not input. @@62impalaconvert
Question with the genius turned on can I just connect the jumper leads to the battery terminal leads then remove and replace the battery.?
Thanks in advance
If you have the jumper leads attached to a new battery. It would be tricky those clamps love to fall off. Thanks for watching!
Thanks, I was careful and got away it but the cigarettes lighter method probably would have been safer . This was a really helpful video as I have the noco . They are a handy little unit. Thanks again.
Or connect up to another car or 12v battery using normal jump leads. Then swap out old battery for new with the jump leads still connected. No loss of volts.
the best answer!
What about when there is an auxiliary battery in parallel … often the case on many Euros?????
Use a old tried but charged battery hooked up to cables and the car's cables. Pull the car battery out and replace with the new battery. It is a two person job but works of you are careful.
That works too! Thanks for watching!
Can I connect that jump start pack directly to the battery instead cigarette ligter ??
Yes
We have a 2015 ford without a cigarette lighter??
So if you connect the booster pack to the obd port you won’t need the jumper cable?
Exactly.
What if the 12v accessory plug is not active when key is not on? And you remove the new battery post covers before dropping the new battery in so you don’t forget to remove later? Really? How might that be possible?
Would this apply to a 2018 VW Tiguan as well?
Yup! Thanks for watching!
Won’t adding the 12 volt jumper add another 12 = 24 volts at least momentarily? Will that do damage?
No, it is in parallel so the jumper may try to charge the battery up to 12v if it is flat, but no higher. Actually chargers usually supply a bit more than 12v (usually 14V).