How to be Smarter than a Smart Automatic Car Battery Charger! An easy Trick to Charge a Dead Battery
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- Опубліковано 20 сер 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 UA-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?
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.
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! 😊👍
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.." 😂😂
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.
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 😊👍
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! 👍😊
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
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 😊👍
Thanks! I partly knew these things but you filled in the important details😀
Great! Thanks for watching Ron! 😊👍
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 😊👍
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!
Wish I'd seen this before giving up on my smart charger and buying a "proper" charger. Great little video
Thanks Colin! 😊
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.
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! 😊👍
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 👍
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.
Glad i came across your video. Excellent information. Thank you!
Thanks Matt! 😊👍
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 😊👍
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 🙄
Wow Sir ..!! Very Smart . Ingenious. Thank You for this Video 🙏
Thanks heaps for watching 👍😀
Thank you for the video. Much more informative than other videos I,ve seen.
Glad you enjoyed it! Thanks 👍😊
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! 😊
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 😊👍
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.
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Brilliant! Thanks so much for posting this very useful video :)
Thanks Andrew! 👍😊
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 😊👍
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 👍😊
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 😊👍
Worked perfectly! Thank you for posting
Thanks Chris, that's great! 👍😊
Excellent video, sir! Thank you for the information.
Thanks Chubby! 😊👍
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
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! 🤣
That's a fine solution. I was thinking in series, i was wrong. Thanks.
Thanks for watching mate! 😊👍
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 😊👍
Worked excellent for my Viking 4 Amp Fully Automatic Microprocessor-Controlled Battery Charger/Maintainer, thanks for posting... \m/
Excellent! Thanks for watching 😃
Thank you sir! I learned something today. It will come in handy.
That's great! Thanks for watching 😊👍
Cheers mate. I will be able to get ny "legs" back in operational order with this trick! Thank you
That's great mate! 👍😊
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 👍😊
Outstanding! I have a few of these and won't give them away! 2 thumbs UP!!!
Many thanks Davil! 👍👍😊
Amazing video. Thanks for sharing. I've hooked another battery to the dead battery and left it for a day.
Thanks Phil! 😊👍
Brilliant! Thank you for sharing this information.
Thanks for watching! 😊👍
Great info. Great explanation of whats really going on in that things brain. Thanks for that mate.
Thanks for watching! 😊👍
Just worked for me🙏thank you for the advice
Fantastic Meeren, that's great to hear 😊
Excellent video. Thank you so much for this.
Thanks Krishna 👍😊
I just had this issue yesterday. Good information to know now. Thanks
Excellent! Thanks for watching 😊👍
Excellent video, love this style of videos from you. I am going to make a similar video about reviving lithium batteries and how the chargers reject those batteries.
Thanks Lucky! Awesome - I'll keep an eye out for that! 😊
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 😊👍
God bless you brother I needed this. Helps a lot.
Thanks Tommy, pleased to be of assistance! 😊👍
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! 👍😀
Hoss, ya just saved my bacon!! I have a large and small battery charger that won't do diddily squat to to the many so called "dead" batteries I have, but now I know what to do!! Thanks a Bundle!! JD
Pleased to have helped JD! Bring those dead babies back to life! 👍😁
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! 😊
Very good information . Thank you !
Thanks Dee 👍😊
Thank you ! Glad I found your video ,before I took my dumb/smart charger apart
Excellent, I'm glad I was able to help! 👍😊
Yes I thought my same charger was stuffed too. ,thanks very much for this info ,I learnt something today 👍
Excellent! Glad to help 👍😊
Thanks dude. You are a global treasure!
Ah, thanks mate! 😀👍🤣
Thanks for posting, great explanation.
Thanks for watching Tony! 😊👍
Excellent presentation thank you team.
Thanks Richard! 👍😊
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! 👍😊
Very helpful . Thank you 👍
Thanks Brian 👍😊
Thank you. Really useful information.
Thanks for watching! 👍😊
Great workaround, thank you! So what is the shoulder strap for? Weapon, man purse? :)
Wow thank you I didn't know this!
I have shared your link on my fb page
Many thanks Andy, that's awesome! 👍😊
I learned something today, Thanks
Thanks for watching! 😊
Brilliant. This probably applies to power tool battery chargers
Thanks. Yep, any modern 'smart' charger I guess 👍😊
Good video mate, excellent work convincing the "smart" charger there is actually a battery connected. Cheers 👍
Thanks Andy, appreciate you watching and the comment 👍😀
Great video young man!! I bought a new battery charger it would charger a dead battery either I will try this. Thanks for sharing be safe have fun
Thank you Mike! Appreciate you watching! 😊👍
Thank you for that video bro that's awesome I had a brand new battery that was dead and I did that little battery thing it works great I love that thanks a lot for the insight it was great
Fantastic! Thanks for watching Leo 👍😊
A great lesson many thanks
Thanks June 😊👍
Great video - simple solution to use the 9V battery.
Thanks Carl! 👍😊
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!
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 😊👍
Perfect timing to learn this for me ...
Excellent! 👍😊
Omg, it worked flawlessly!!
Excellent! Great to hear! 👍😊
Absolutely wicked mate.
Haha, thanks mate! 😊👍
Waw, its like 'jump starting the battery charger with a 9 volt battery'; brilliant hack, thanks 🙏
Exactly! Thanks for watching 😊👍
Excellent hack ! Thank you.
Many thanks David! 👍😊
Hey that's pretty good trick I wish I would have come across this video earlier I had a battery that had zero and my charger wouldn't do anything to it I'll definitely use the trick thank you much for the video asure thumbs up
Thanks, glad it was useful! 😊😊
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! 👍😊
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 👍
Excellent video sir hope it helps many people.
Many thanks Stephen! 😊👍
Good info! Thanks for sharing!
Thanks Ray! Thanks for watching 👍😊
Ha ha, yes it's always better to make friends. I have an old style charger but if I come across a smart one I now know how to deal with it, thanks Chris. 👍
Friends are much better than enemies AF - especially with electrical items! 🤣
Excellent tip much obliged.
Thanks Dave! 😊👍
Well, that is handy information. Thanks.
Thanks mate 👍😊
Great idea thank you!
Thanks Paul! 👍😊
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 👍
I loved the Curiosity Show and wondered where you got to!
Haha, I used to watch that too! My inspiration maybe? (for science and the moustache!) 🤣
Thanks for sharing this.
Thanks for watching Brian 😃👍
Very interesting Chris 👍.
Who would have thought these 'smart chargers' are a bit bit stupid sometimes!
✌♥️🇬🇧
Technology and smart don't always go together Les!🤣
@@TheUltimateRecycler
To be honest Chris anything with a 'smart' before always makes me dubious, in England we have now got smart motorways, they changed the hard shoulder (break down lane) into a traffic lane so they could get more cars down them faster. But if someone breaks down!!! They are death traps, there have been quite a few major pile ups. Anyway glad you're back without the heavy deadline, it was stressing me out mate 🤣😂🤣
Enjoying your more relaxing fixing things show and I can't wait for your unboxing of all your treasures in the future.
Take care mate. ✌♥️🇬🇧
NiceLy done outsmarted the smart charger
Thanks Jerry! 👍😊
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! 😊👍
Thanks that's great information
Thanks, glad it was helpful! 😃
Thank you Sir, I've been sat scratching my head wondering why my new 'smart charger' isn't working!!
Yep, I initially had the same itch! Thanks for watching Gavin 😊😊