How to be Smarter than a Smart Automatic Car Battery Charger! An easy Trick to Charge a Dead Battery
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- เผยแพร่เมื่อ 20 ส.ค. 2022
- Here's some information that may well be helpful if you've ever had to tangle with a modern 'smart' battery charger when charging up a very flat battery!
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Poor engineering causing an unnecessary inconvenience
Looks fine but))butter
@@user-ty1ju9do3d Requiring an existing voltage is how they make the product safer. It prevents sparking when the leads are shorted, applied or removed.
A tip to use a battery charger for electrolysis.. higher volts are better.. setup your bath filled with WATER & terminal on & switched on .. now add acid (or caustic soda.. it's just an electrolite) till amps rise to a sustainable or desired current (for overnight or like.. gentle jobs).. I use an STC 12/24v early 80s era trickle charger to 10amps g rust explodes off.. caustic doesn't attack base metal steel or galv plating/hot dip 👍
Thank you
If this is all TH-cam ever gave me, it was worth it. Sir, you're a friggin' genius!
Haha, thanks Stephen! It wasn't my original idea, but I'm happy to have shared it with you 😊👍
@@TheUltimateRecycler I wonder if others realize too, that this is the exact same method that MIGHT work also for charging those batteries for power tools that use Lithuim cells.
Sometimes, there's a bad cell (one, two perhaps) that cause the charger to refuse to charge the battery pack.
For those who are confident in taking one of those apart (BE SUPER CAREFUL, LITHIUM CAN BE DEADLY) one could find the bad cell(s) with a multimeter and then just "jump" it (or them) with good cells or an adjustable power supply and kick the charger into gear.
Been there, done that. It works.
I learned of this trick some 10-15 years ago. Just remember to check the fluid levels before you begin charging, since it's a lead acid battery. This wake up technique also works with Ni-cads and Li-ion batteries as well.
Thanks and good advice with the fluid levels 😊👍
Absolute genius. No more frustration and my battery got charged. Thank you
Excellent, that's great to hear Randy! 😊👍
Yoy are welcome but do you know how to build it?
You can also add a diode to the 9v to allow power to the charger but not worry about not leaving it on too long.
Yes, great thought! 😊👍
Had this happen a lot and I just grabbed a spare 12v battery to get the charge cycle started. The 9v battery is a brilliant idea. A cool mod to the charger would be to put a battery inside with a momentary switch labelled 'dead battery kick start' (or something better lol).
Yep, it wouldn't be hard to do that mod. I believe many smart chargers have an override switch now.
Makes you wonder how many perfectly good battery chargers go in the trash each day because people simply do not know. This is when reading the instructions that come with the battery charger come in handy
Yes, it seems many have been thrown out! Since most don't read instructions, maybe there needs to be a large sticker on the charger to explain that it's different to the old style!
@@TheUltimateRecycler
And why would they read that?
@@davidhenderson3400 Because the sticker would start with "Free beer.." 😂😂
Thank you so much. I was having trouble charging a battery for hours. As soon as I did this I had a full 12vDc within an hour. Genius.
Excellent, I'm glad it helped 👍😃
Thank you very much. I'm an old experienced handy man with no smart charger experience. You have taught me a lot! Very clever demonstration! Thank you again! Erich in New Zealand ☺️
Thank you Erich, glad my content has been helpful! 😊👍
Brilliant! Just the information I needed. Bought a smart charger and the instructions were woeful. Got error message but didn't know why. Now I do. Cheers buddy.
Thanks Dean. Yes, many instructions are woeful these days! Cheers 😊👍
That's a Big Trick simplified by your explanation over the top of the presentation. Many people have done this type before yet never convinced me as you have . This will be great for the squillion power tool batteries in the world . Thank you , much appreciated .
Thanks for watching and your excellent comment KM!
Fantastic video. I had same issue with my generator battery. I hooked up my BATTERY TENDER & it wouldn’t charge. Checked voltage, only had 3.2 volts. Put the 9 volt inline & instantly recognized it and started charging!!
Showing 12.5 now within 1 minute. Glad I found your video. Thanks
That's awesome Stephen! Well done. Thanks for watching 😊👍
Thank you for this awesome trick, i used a 12v drill battery for mine and it did the job great. I will be keeping this one in the books!
Excellent James, glad you found the video useful! 👍😊
I was at ends wit and I am so grateful I stumbled upon your video. This trick worked like a charm. Thank you very much for the thorough explanation because I have no experience with any electrical components!!! Paul from El Paso, Texas.
That's excellent Paul, I'm glad the video was helpful! Thanks for watching 😊👍
Wish I'd seen this before giving up on my smart charger and buying a "proper" charger. Great little video
Thanks Colin! 😊
This was amazing...only wish I'd seen it before I threw out my old Genius smart charger and bought a new one.. (it was behaving the same way) Thanks for sharing this information!
Thanks Kelvin. I wonder how many perfectly fine chargers went into the bin?
Great idea. Way easier than finding another good car battery to kick it off to charge. Thanks
Thanks for watching! 😊👍
Great idea. I have an old dumb charger with just a transformer and rectifier. That will work on a totally dead battery. It may pop the breaker a few times due to the surge but will eventually charge the battery. It brought my battery back from the grave and it's still working fine years later. Sometimes I hate new technology. They outsmart themselves and make life difficult.
Thanks mate. Yeah technology is just too clever for itself sometimes! 🙄
I cant find an old dumb charger, new or used! My new computer controlled charger is incredibly fast at charging a good battery, but will not charge a dead batyery, which is basically when I really need it!
I do the same thing with my dumb charger. The 9V battery trick will come in handy if one does not have a dumb charger or spare battery handy.
@@TheUltimateRecycler well, you have misunderstood the point of this behavior. They made it like this because not so smart people might let the clamps on the table and make short circuit that might lead to fires. Sure, there are simple circuits which might be used to limit the current but the charger will still overheat if left in this state for long time. The solution to start the charger only if it has a few volts between the leads is a simple one.
Oh my I wish I had seen this a month ago, my neighbor just went through this on her two year old 12 volt lawn tractor mower battery. I tried to charge her battery and nothing happened, so she bought a new battery, if only I had known about this, of course the dealer said nothing and just sold her a new battery. Great video and I will pass it around to people I know, thank you for showing this.
Many thanks! Yeah, some dealers just want sales without actually being helpful!!
Just think of all the good batteries that have been thrown out thanks to these very questionably designed "smart" chargers
Did this with my battery tender 4amp "smart" Dual regular & Lithium charger & your regular 9 volt battery hack by just tapping 5x's the connection for one second each tap, Battery Tender recognized the dead "Lithium" 12 volt motorcycle battery and within 5 seconds was charging. Brilliant, & Cheers, Eric from NC-USA.
That's excellent Eric! Thanks for watching and sharing your success 😊👍
Very clever! I just had a similar experience with a smart charger I own and a vehicle sitting unused for a few months. Fortunately, I have a second charger with a "jump charge" function that got the vehicle battery past the smart charger's "start volt" threshold. I knew what you would do as soon as I noticed the 9V battery and clip leads in the background. I'll remember that!
Yeah I believe some chargers now have an override switch which is sensible! Thanks for watching 😊👍
This will come in handy some day. Wish I had one of those old heavy battery chargers.
I have a few floating around - I usually sell then in the shop for $20 - $30
Oh that's so nice. Much simpler than the other ways to deal with that problem.
Thanks NA 👍
Excellent tip. I have had the same problem, and to solve it I hooked up my booster pack 3 times for 20 seconds .... pushes a very low level of charge into the battery, but enough that my "smart" charger can recognize and start its cycle.
That's another way to kick start things, yep. Thanks for watching 😊👍
Wow, how useful! I have a so called "smart charger", and same as this one, 0 volts as a power supply, a flat battery also gives 0v. Definitely going to try this hack. Thanks for the information.
Thanks for watching Neil! It should work fine 👍😊
Wow Sir ..!! Very Smart . Ingenious. Thank You for this Video 🙏
Thanks heaps for watching 👍😀
I have a Dodge Journey that has 2 12v Aux ports, one that should only turn on when the car is on and one that is always on. The switched port stopped working, so I plugged my cell signal booster and dashcam into the always-on port. Unfortunately, I didn't drive the car for a few days and it drained the battery. I have one of these "smart chargers" and it refused to charge the battery, with a msg "battery fault". Once I jump-started the car with my truck, the battery charged right up. Gotta love how they "make things better" by completely screwing them up.
Haha, yep and they call it "progress"!! 🤣🤣
"Smart chargers" were a stupid invention. Some things should just be left alone.
Nice tip thanks Chris. I have a 12V charger but haven't had call to use it in ages.
Thanks Longship. No flat batteries is a good thing! 😊
Amazing video. Thanks for sharing. I've hooked another battery to the dead battery and left it for a day.
Thanks Phil! 😊👍
Good info! I've put a "wall wart" 12v power supply on a car battery for a couple of hours before to put enough into it for the new charger to turn on. Technically, I guess if you have a few days to wait, that same wall wart would charge the battery at a steaming 500mA - 1A. If I cared enough or had enough time, hunting down a floating charge circuit would probably make it a useful thing to keep hooked up. The battery maintainer chargers are like that, but I'm too lazy to hook one of those up. Lead acid batteries are pretty much a rental item here in the States. They build them to last almost exactly what the warranty is, and if it ever froze discharged, it seems like pretty much game over for that battery no matter what you try.
We don't have issues with freezing here, but I've wondered how that effects a lead-acid battery! 🤔 Yes, manufacturers of all kinds have pretty much mastered the skill of making something that just makes end of warranty period 🙄
Thanks! I partly knew these things but you filled in the important details😀
Great! Thanks for watching Ron! 😊👍
@@TheUltimateRecycler I knew to boast them with another battery , but never thought of using a simple little 9 volt
Fascinating, I had exactly that yesterday when my daughter left an interior light on in her car flattening the battery. I was about to return the nearly new smart charger!
Timing is everything Keith! Glad I was able to help 😊👍
That's a fine solution. I was thinking in series, i was wrong. Thanks.
Thanks for watching mate! 😊👍
Excellent! Thank you very much for a quick-ish (could be more terse), effective and informative demonstration. I've wondered of late exactly about using a battery "jumper" and if needs to stay on for the entire charging duration or just long enough to momentarily satisfy the "smart-charger's" test threshold. People always want to call that "fooling the system" . Uggh! Anyway, there are so many bad videos that are verbose, circular, unfocused, rambling, incorrect technically and/or "muddy", overly long and rather boring and/or stupid. Your video shines like a beacon in the galaxy ... to paraphrase Forbidden Planet! Seriously, I cannot thank you enough!
Man, that comment rates well into the top ten of the best & most complimentary I've received! Many thanks from one beacon to another! 😍👍
Forbidden Planet was my favorite old time SciFi movie. What has that got to do with battery chargers? Absolutely nothing.
I am doing a hybrid battery right now...your question of leave the jumping battery on through the charge is important. when I use another car battery to bring them up to where the "smart" charger charger will latch on, I just flash it for a few seconds. I have a voltmeter clipped on the dead cell, and can immediately see when the charger kicks in and starts climbing, thats when you can disconnect the good battery.
P
Kudos to this suggestion. It's a lot easier than running jumper cables to another car to obtain the same result. And what if you don't have another car or set of jumper cables? It's easy to just break out a 9v battery and give the thing a 'kick' enough to start charging.
Thanks Mr C. Yep, it's an easy hack 👍😊
Worked excellent for my Viking 4 Amp Fully Automatic Microprocessor-Controlled Battery Charger/Maintainer, thanks for posting... \m/
Excellent! Thanks for watching 😃
Brilliant. This probably applies to power tool battery chargers
Thanks. Yep, any modern 'smart' charger I guess 👍😊
Sir. Thank you for your video, it seems to have helped quite a few folks. An older battery, especially one that gotten as dead as it was, might mot have the ability to take and hold a full spec charge. Your charger is 4.3 amps. 1.5 hours would give an output of about 6.5 amps. the battery would only absorb part of that, say 4.5 to 5 amps. The new capacity of that small 9 plate battery should be around 37.5 amps. At 1.5 hours the battery cannot be very full from the charge rate. It would probably take 10-12 hours to give that battery the best charge it could take considering its condition.
My information is free and worth every penny....
A T Burke
Yes, that sounds about right AT. Actually, I don't think the battery was any good in the end - but that wasn't the point of the video. Thanks for watching 😊👍
Brilliant! I may have tossed a smart charger years ago because I didn't know this. I don't understand why the 27 thumbs down (as of my viewing).
Who knows Dan! I guess some people have nothing better to do! Thanks for watching mate 😊👍
Glad i came across your video. Excellent information. Thank you!
Thanks Matt! 😊👍
I just had this issue yesterday. Good information to know now. Thanks
Excellent! Thanks for watching 😊👍
I touched the 9-volt battery to my tongue while it was connected to the car battery and charger and now I can't feel the left side of my face. I feel like I was riding inside an asteroid or a comet or something.
Fortunately yes! The left side of your brain is now balanced with the right! 🤤
Good news! Now you're not the only one who liked your own comment! 😉
@@OGRH I don't understand all of it.
@@dammitbobby283 🤣
Try it on your nuts and see if you are still laughing
Waw, its like 'jump starting the battery charger with a 9 volt battery'; brilliant hack, thanks 🙏
Exactly! Thanks for watching 😊👍
Worked perfectly! Thank you for posting
Thanks Chris, that's great! 👍😊
Thank you for the video. Much more informative than other videos I,ve seen.
Glad you enjoyed it! Thanks 👍😊
Thanks for the tip, I have a dumb and a smart one and I was using the dumb one when the smart one wasn’t willing to, now I learned how to trick it ! Cheers
Thanks Retif - we need to stay smarter than our equipment! 🤣
Omg, it worked flawlessly!!
Excellent! Great to hear! 👍😊
Awesome information. I tossed out a few SLA batteries that my smart charger would not charge. Will try this fix next time. 👍
Thanks Jerry! No sense throwing out things we don't have to! 😊
Outstanding! I have a few of these and won't give them away! 2 thumbs UP!!!
Many thanks Davil! 👍👍😊
Im glad I came across your video. It just so happens I have a "Smart" charger that has no output voltage. I will try and re-train it like you did. Will let all kmow how it works out.
Perfect! Hope it works for you Jim! 👍😊
Awesome trick! I was going to find a good car battery and hook up leads to trick mine. I thought about using a 9v but thought it would fail, Thanks for the tip.
No worries Jon, glad you found the video useful! 👍😊
Cheers mate. I will be able to get ny "legs" back in operational order with this trick! Thank you
That's great mate! 👍😊
right on! thanks ,, i hate the new charger
They have their place though. They are better at maintaining a good battery for a longer life 😊
Smart chargers suck period. Love my old solid state manual charger.
Love this video!! Thank you
Just worked for me🙏thank you for the advice
Fantastic Meeren, that's great to hear 😊
God bless you brother I needed this. Helps a lot.
Thanks Tommy, pleased to be of assistance! 😊👍
Excellent presentation thank you team.
Thanks Richard! 👍😊
Worked perfectly. Using a Schumcher automatic charger (1304), charging a battery that showed 0.2 V on meter as I write this.
Excellent Thomas, thanks for the feedback! 😊👍
Very good information . Thank you !
Thanks Dee 👍😊
Excellent video, sir! Thank you for the information.
Thanks Chubby! 😊👍
Excellent video sir hope it helps many people.
Many thanks Stephen! 😊👍
Brilliant! Thank you for sharing this information.
Thanks for watching! 😊👍
A great lesson many thanks
Thanks June 😊👍
Good video, the only thing forgotten is always remove caps so pressure doesn't build up, fluid level helps too.
Yep, good point! Thanks for watching 😊👍
Needed to be "excited" to begin charging. Reminds me of the days when generators were installed in everything.
Ah, those were the days! Thanks for watching Grampa Garry! 👍😀
I used this trick a few weeks back to get my "smart" trickle charger to start charging on one of my seldom used motorcycles. Worked great and now my smart charger is keeping a maintenance charge on the battery.
Excellent! Thanks for watching Rob 👍
Thank you.
You're welcome! Thanks for watching Robert 👍
Thanks for posting, great explanation.
Thanks for watching Tony! 😊👍
Thanks dude. You are a global treasure!
Ah, thanks mate! 😀👍🤣
Great video, see so many people trying this with huge batteries or daisy chaining them no need it just needs to feel something to kick in.
Exactly! No sense dragging around heavy batteries if you don't have to!
Just had this happen to me!! Thank you for the information!!
No worries Robert, thanks for watching 😊😊
Thank you
Thanks for watching! 😀👍
Very helpful . Thank you 👍
Thanks Brian 👍😊
Worked great! BTW he's also right about it not even taking 9v.
I just happened to have a 5.5v wall wart I'd previously soldered test leads too for electroplating on hand. So l tried that 1st. Worked fine...
That's great! Yeah - it doesn't need much to kick the charger into gear! 👍
Actually most such charging systems a kick on as low as 4 volts.
Great video! I have a smart charger and an older transformer charger which has some degree of automatic charge level. The old one should switch to trickle automatically but stopped doing that. I have a battery which has given strange problems. Below around 12 volts it sometimes just disappears. The smart charger will not work. Using the other charger wakes the battery so the smart charger will work.
My smart charger is relatively clever. It goes through a series of different charging modes depending on the state of the battery, reverting to a standby mode when the battery is full.
Thanks Michael, sound like you have your charging pretty much sorted 👍
Excellent hack ! Thank you.
Many thanks David! 👍😊
Great video - simple solution to use the 9V battery.
Thanks Carl! 👍😊
Thank you sir! I learned something today. It will come in handy.
That's great! Thanks for watching 😊👍
Perfect timing to learn this for me ...
Excellent! 👍😊
Brilliant! Thanks so much for posting this very useful video :)
Thanks Andrew! 👍😊
Yes I thought my same charger was stuffed too. ,thanks very much for this info ,I learnt something today 👍
Excellent! Glad to help 👍😊
My charger was purchased at Sams club years ago and it has a 100 amp start mode and when I run into a dead-dead battery I just hit the start mode for a couple of minutes and put it to 15 amp charge, unplug and replug and that normally works. Sometime it takes a second 100 amp boost but that usually does it. If I have time I'll charge it on a 2 amp charge once its 12 to 13 volts. Overnight it possible. As. cheap as trickle chargers anymore I just keep equipment I don't use a lot on those.
Yep, start mode and 100 amps is exactly what is needed! Thanks for watching mate 😊👍
Excellent video. Thank you so much for this.
Thanks Krishna 👍😊
Thank you. Really useful information.
Thanks for watching! 👍😊
Right on, thanks
Thanks for watching! 😊👍
Very clever. Thank you.
Many thanks for watching 😊👍
Great info. Great explanation of whats really going on in that things brain. Thanks for that mate.
Thanks for watching! 😊👍
thank you
Thanks Leon! 😊👍
Many jumper packs have a safety override to get around the dead-flat battery issue. Smart chargers need one too. You can probably add one by wiring a 100 ohms resistor in series with a momentary switch across whatever isolates the output.
I believe many smart chargers now have an override, which is sensible! Thanks for watching 😊👍
Some chargers have a boost or low voltage button that pretty much does this, but the 9V battery is ideal as its something that many people will have. Give it a good charge and then a run on a good reconditioning charger to help desulfate it and it will be a good spare
I have one of those Honda desulfating chargers and it works rather well.
I tests the battery to decide its condition, then will either charge it up and maintain, or will charge, then go into desulfate mode, then charge and maintain.
Works well.
When I had my solar panels set up, I had a stand-alone desulfator across the entire bank. I used 6 deep cycle lead acid batteries and got about 12 years out of them!
Yes I believe that some have an override button which is a good idea. Reconditioning chargers are great for getting the best life from a battery. The one I used had a crook cell though - but it was a good example for the video. It ended up going to the scrapyard!
Absolutely wicked mate.
Haha, thanks mate! 😊👍
Great idea thank you!
Thanks Paul! 👍😊
Thanks
Thanks Flipper! 😊👍
Good info! Thanks for sharing!
Thanks Ray! Thanks for watching 👍😊
I learned something today, Thanks
Thanks for watching! 😊
Brilliant TUC ! This helped me no end with my mobility scooter ! (2 x 12v x 75ah batteries!).
The charger , after a year or so of non-use, charged the scooter overnight - but next day not all the lights were lit which was odd! The scooter was useless - no power at all uphill. Would move on the flat or downhill.
I was going to remove the cells and treat them like this video does the flat battery - BUT the charger knew there was a battery or two connected so I aborted that idea!!!
I wondered if the charger assumed full charge because the voltage from the scooter exceeded 12v? I propped up the drive wheels and ran the motor with no load at HIGH and LOW and Hare and Tortoise speeds and the wheels kept turning! (Toilet roll tube on the handle bars and over one paddle is a good way to run the battery into the ground).
I ran it down to near zero on HIGH. Then switched to LOW where it ran on 3 reds until it dropped to 2.
Turned off the display showed in the amber zone so I could have discharge for longer for sure.
Recharged the scooter and it charged up with an hour and the power was as good as new! Drove up the ramp into the Berlingo - no problems. I just need to use it nw and the charging cycle will improve imho.
I was almost ready to order Lithium batteries which would be £600 to over a grand for 75ah - so Ulimate Recycler is a hero in my house! Thank you for the tip!!!
Haha, thanks Mike! 😃👍
Thank you, thank you, thank you!
.. and thank you Michael for watching! 😊👍
Excellent tip much obliged.
Thanks Dave! 😊👍
That's pure gold! 👌
Thanks! 😊😊
Thanks!
Many thanks Greg, that's awesome!! 😀😀