12v Charger Won't Charge or Recognize a Battery? [Easy Fix in Under 5 minutes]

[@HomeBatteryBank]

Just realized I recorded this with a close-up lens, hence the blurriness. 😭 Sorry for that.

[@TM-rp7bd]

I asked a question below I hope you can share your expertise on. Thanks for the knowledge i hope you get the credit for the battery tender i just bought

[@robertstankay8753]

Great presentation n video super tips had a new battery charger wondered why it would not charge a real old dead battery thx

[@sak1237]

No go for me. Boosted the dead battery i.e. started the car, let it run for 60s, turned it off, left the good battery connected via jumpers for 5 min, disconnected, drove the car with the "dead" battery for 15 min, then re-connected the tender and it still shows "Full Charge". Does this mean my tender is shot?

[@joshjaklich]

Holy crap! It worked! Hooked my Subaru battery to my deep cycle batt, with jumper cables and then started car. Turn car off and let sit for 5 mins… then reconnected battery charger… it recognized it and started charging! Thx!🙏

[@jacobutting9931]

Great video, sir. I left my motorcycle key turned and I came home to find it dead. The battery charger I purchased didn't have any effect until I found your advise and gave it a good surface charge to begin truly charging the battery. Again, good shout. You are doing God's work.

[@terryrowe5982]

Bro thanks for the video. I have a 69 C10 that hasn’t been cranked in at least 4 years!!!! The battery was dead…RIP 💀 my battery charger would not recognize the battery. I used my wife’s Honda to charge the battery for 10 minutes. After ten minutes the battery charger started working. I saved myself $250 bucks for 10 minutes of my time! That’s $1500 an hour. I found a new side hustle… 💰💰💰💰😁 Seriously thank you so much!

[@tekbit3305]

I purchased a new truck battery less than 3 months ago and found out something was draining the battery. This saved me from buying a new battery. Thanks!

[@johninkcmo]

Thank you so much! My truck battery is dead so I bought a cheap trickle charger and it first didn't show anything other than power. Then later showed error. With your help and my backup jumper, I charger the battery enough to get the trickle charger to recognize the battery and start charging! Thanks! 👍

[@HomeBatteryBank]

So happy to have helped!

[@DustineNannette]

Worked like a charm on my boat battery which I ran down to near nothing and just kept getting a bad battery light on my charger. Battery was only 4 months old so I was almost sure it wasn't the battery...so came to you tube looking for the answer and you gave it to me! LIKE for sure! Thanks!!

[@moderatorbonniem6655]

TY VERY MUCH. YOU SAVED ME FROM BELIEVING I NEEDED A NEW BATTERY. I JUMP STARTED THE CAR, LET IT RUN FEW MINUTES, REVVED ENGINE A FEW SECONDS. TURNED OFF CAR. PUT MY BATTERY CHARGER ON AND IT WORKED

[@HomeBatteryBank]

Happy to have helped you out! :)

[@Michael-oc5ut]

It seems like mine is being recognized at only 8 volts but the light turns green like its charged but there is no way it charged because it was only on for 2 hours. Any fix for this? its agm so i can't swap the fluid

[@vickiemiller8753]

My son's bmw has a AGM battery that I'm having the same issue with. My question is.. Can I use any good car battery (different CCA, brand, run hours, etc.) to do this, or do I have to use the exact same or type of battery to get the dead one to be able to charge?

[@joshjaklich]

Holt crap! It worked! Hooked my Subaru battery to my deep cycle batt, with jumper cables and then started car. Turn car off and let sit for 5 mins… then reconnected battery charger… it recognized it and started charging! Thx!🙏

[@cheezalibra8191]

Took my battery to Autozone and they couldnt charge it. I did what you said and now its charging! I hope for the best. thanks.

[@EtonbeachTreasures]

Hello from the Fiji Islands. Wow, that was such an easy fix. Hubby couldn't believe it. He was just about to smash the charger against the wall as it was only reading a 6V battery instead of the 12V. We have a Powertech Plus MB-3611. The spare 12V battery is one we use for our gold high banker. Def worth a connection with you and a like👍🌞🌺🌊

[@Yam_man90]

What about lithium battery’s? How bad are they of left uncharged for say a couple months.

[@abbyzstuff]

Thank you for the info! This was exactly our problem and once we got that quick/surface charge on the tractor battery, the charger worked!! Thanks again!!😅

[@HomeBatteryBank]

My pleasure 🙂

[@MrMwpBeats]

Thanks sir! I took your advice and now my smart battery charger is now able to give my battery a charge.

[@HomeBatteryBank]

Happy to have helped!

[@lifesaverd]

Thank you Bud, this worked perfectly, only thing I did differently was i have an old mechanic style charger that is stuck on 12v jump so i hooked it to the battery for 3 min and monitored the voltage with a multimeter, the jump setting put battery from 0.03v to 11.87v so I disconnected and hooked to the battery tender plus, it is charging now, big help watching your video

[@Ridethebomb777]

Two helpful pieces of info I can add to this. you can also put a base level of charge back into a completely dead battery by disconnecting your battery cables ... hooking up your booster for say 20 secs at a time. I needed to do this 3 times to get a base level of charge in the battery so the "smart" charger would recognize that the battery was not completely dead and then it started the charging process. Second tip: If you are in a hurry to go .... just disconnect your battery cables from the battery and hook your booster pack up to the cables ..... the car will start. Then with the car started carefully replace the cables. If you run the car long enough you will get a charge back into this dead battery.

[@brandonmoney3297]

Thanks man, my smart charger wouldn't recognize my battery. Gave it a little charge from a booster for a few seconds and it fixed the issue.

[@Ampelm4n]

I can’t thank the two of you enough, the video and your comment together saved my car battery that I almost gave up on!

[@brandonmoney3297]

@@Ampelm4n Hell yeah, happy to hear that.

[@jakobschiellerup872]

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[@AmericanMuscleZ28]

If I do the second method of disconnecting the terminals and jumping it from just the cables then reconnect battery once car is running, would I connect the positive terminal first then negative, or negative first then positive?

[@gerrymcintosh4477]

Im curious to know, if the battery can be desulfated. My battery shows over 12 volts and at 28 percent health according to my battery tester.

[@schlehuserpsn5769]

Great Video. I tried hooking the charger to battery, then hooked a standard 9v battery with wires between the clips, then plugged charger into the wall. The charger recognized and started charging, so I unhooked the 9v and it continued to charge no problem.

[@kurtkelsey9451]

Jetski battery was at 5 volts charger wouldn’t charge. Tried this hack and good to go… thank you so much. These new smart chargers aren’t so smart…

[@HomeBatteryBank]

Awesome! Glad to have helped!

[@paulclarke7406]

Hi I’m Paul I’ve got an assist battery bike the battery is dead trying to get charger but it’s been on the bike for about three year with out getting charged or used will it charge up

[@snowyowl9132]

Is it ok to hook up a 12 V 10Ah/20Hr Valve regulated rechargeable battery with the car jumper cables setup to get the surface charge for it?

[@user-rr1nu9jo5y]

Thanks for the video. A low enough or dead battery acts like a resistor. When jumping vehicle with another vehicle let the connection run for 5 minutes on 2k rpm.

[@jackAdelizzi]

You learn something new everyday. This worked. Thank you.

[@georgesummers9660]

Worked with no problems! Thank you for this video!

[@ociriszues]

Will this work on lithium battery (dead) from my harely connected from a car battery (good)?

[@TM-rp7bd]

Appreciate the insight. QUESTION: According to your video on "Difference Between Float and Trickle Charger"; under the conditions that the Schumaker Model you described, will the "bad" battery, that has been sitting too long that you referred to here,,,,, be restored back to working condition if the Schumaker brand is used with the de-sulfate option because the crystals are now broken up.... hence allowing the automatic charger method you used here to work once again? Pardon my ignorance on the matter the most I know is what i just learned from you. cheers

[@HomeBatteryBank]

Sorry for the late reply. It totally depends on how long the lead sulfate has been on the plates, how thick it is, and a myriad of other factors. I think the desulfation/equalization modes are better for routine maintenance after a couple of deep-cycles (to knock off the newly formed lead sulfate as the battery's state of charge dropped) instead of trying to resurrect a battery that is already out of commission.

[@nugget5103]

That was some great information. Didn’t know why batteries that were dead for a long time the reason they won’t work. Hope mine can be resurrected, but now I know why it can’t if it doesn’t.

[@oliverfriend66]

Will this work on a brand new battery and not do damage?

[@Nicsiq]

I love you! The battery thats been sitting for 3-4 years is now charging again! +1 +1 rep

[@Nicsiq]

Car battery that is ;)

[@HomeBatteryBank]

Awesome!

[@ReadTheBible33]

Does this work for lithium batteries in a golf cart 12 V? Someone to this answer thanks

[@richardlepack7250]

Can’t believe I didn’t know this. I had a problem with my smart trickle charger and it didn’t recognize my motorcycle battery. I tried an old analog charger and the amp needle would jump to Max then immediately fall back to zero then repeat. I took my power pack out gave it a charge, took a few tries ( including alarm system going off 🙄 which is why the battery was dead too 😉 )but got the analog 12v charger going for an hour or so then plugged in the trickle charger and seems to be charging now. Thanks!

[@RyanHarnwell111]

Thanks man, this is awesome, and just saved my boat battery

[@nitahudson9704]

Can u use a fully charged battery instead of another car.and give it a surface charge???

[@eriksnead6391]

I believe your video just saved my life

[@wadestanford1392]

Both my battery chargers say that my battery is charged but when I check the voltage it is at 10.3v. Just wondering if you think that this method might work. I live in an apartment so I would have to take the battery out and use it through my motorcycle battery which is out but is fully charged.

[@dp5383]

Thank you for this! Worked like a charm. You'd think Battery Tender would mention this in their manual.

[@danlford]

You'd think they would make a battery charger that would actually charge a dead battery which is the very reason we bought a battery charger right

[@rikmoody3760]

Saved me a lot of hassle, thanks man.

[@jesseshantz4595]

What a great video. Thanks man. Please continue what you are doing. You are good at it.

[@timothybrummett8874]

Dood! It actually worked! First try on a completely dead car battery.

[@Essentialearthrandy]

Thanks very much. It worked for my golf cart!

[@coach_paul_t]

This just saved my motorcycle thanks I was getting super frustrated

[@brendanoshea2186]

Worked! Amazing, thank you very much mate

[@Nathan-wh6tn]

this worked great. thank you. saved me $50 for a new battery

[@HomeBatteryBank]

Awesome! Happy to have helped!

[@jerry6070]

Worked great. Clear explanation. Thanks 👍

[@maliser8]

Thanks so much! My battery died because of cold weather so I had to bring it inside, then charge it with the car so the charger would work.

[@korruptikagaming1409]

Would this work on a 12v 5 ah lead acid battery

[@joeybez5464]

Battery sulfated needs a desulsfur thingy ?

[@tselemental2249]

Thank you so much you saved my day of riding lol

[@rickybobby1065]

It worked on my truck!! Thank you

[@dustincarlson8989]

Worked perfectly. Thank you!

[@debunkthejunk1]

i Googled "E-1" error code and this video came up. Can confirm "over discharge" was the cause. Since the charger is only looking at the voltage and doesn't do a current pull any 12V DC source will work to "trick" the charger. I used my buddies charger and slid the clamps from his charger to mine while connected to the battery. You could probably stack x4 watch batteries if you wanted to MacGyver this.

[@juliocalderon8806]

I was having same problem no connection then i connected Jumpstarter for 10 sec and it recognized it and started charging thanks for help!!

[@AshtonCrittenden-lc7tr]

Men you are the men I mean holy cow I watched other videos no help but this actually worked so impressed by it I went into this doubtful as hell but now men thank you

[@piratefueljim]

Thank you, you helped me. I almost returned it.😊

[@HaploPrime]

I did this with my car with a battery that was sitting for a year and it worked. I didn't use another car though. I have a jumpstart portable battery bank and I plugged onto my car battery and jump started my dead battery (multimeter was reading like .042v). I let it run for like a minute while pressing the gas in neutral. Checked my multimeter and it read 13v and and I turned off my car and unplugged my battery and plugged in the charger and it started working. Fingers crossed it can bring my battery back from death. I guess we'll see in 24 hours. You're a life saver. Thanks for the tip.

[@lesterdampie6134]

Please come back with an update. 11 hours and counting 😆

[@elizabethmeighen7591]

Very informative! Ty!

[@SkibbidyDragon]

You are a live saver my friend.

[@banglabanger3300]

Thanks a million for sharing your genius , you have saved two battery's from the dump.

[@HomeBatteryBank]

Awesome! Happy to have helped! 🙂

[@omegadragondTTV]

Great tip. Worked well for me cheers!

[@venturalocal1040]

Thank you for explaining this, simple good information...that worked

[@WendyWindows]

Batterys 12.9 but charger said 9.5 and wpuldnt let me choose the vehicle. The charger now won't light up it only flashes a little light on the scrern when first plugged into the house mains.

[@viktorweisshaupl9433]

An alternative to the car battery is an old-fashioned car battery charger without the sophisticated electronics in the modern chargers. I have one since decades and it helped in that situation since it charges regardless of the voltage of the empty battery.

[@davidbarlow269]

Yes agreed ..old school does not protect from charging into an assumed dead short eg dead battery.

[@viktorweisshaupl9433]

@@davidbarlow269my one has at least a fuse like in cars to protect against exceeding current.

[@NCdawg001]

Thanks! Worked like a charm.

[@tomhubbard353]

There has been numerous YT videos on this subject. I have several chargers from shop/cart type to your smaller lower amp bench top type. Battery chargers are based around a transformer converting 120VAC to 12-14 VDC. The transformer is going to produce that voltage as soon as it has power going into it. I am curious as to whether a momentary switch could be added to a "smart" charger to jump the voltage around what I am assuming is a relay stopping the DCV from going to the charge leads until correct DC voltage is recognized. Theoretically turning the charger on, tapping the button would energize the charge leads weather there was a battery connected or not. How long you have to hold the button down would be dependent on how low the battery voltage is and your selected charge amp rate. I have not opened up one of my chargers to test this theory out, I have a cart type that is a smart charger that needs to be "fixed". I understand the dangers in this IE running a smart charger the same way all of my other chargers work requiring ME to pay attention and hook it up correctly. Maybe someone has played with this already.

[@shannonh3468]

This worked well for us! Thank you!

[@HomeBatteryBank]

Awesome! :)

[@MrEye4get]

Saved me from ordering a new battery for my riding mower!!

[@chrisforrest4581]

Thank You !! this trick worked for me.

[@HomeBatteryBank]

Awesome! Happy to have helped you out 🙂

[@FernandoGonzalez-ec8xe]

It Worked! Thanks a lot!😊

[@mauricioo7188]

It worked in my motorcycle battery Thank you

[@HomeBatteryBank]

Awesome! Glad you are back up and running! 🍻

[@whollenbeck8]

I have a tip. Fix your camera focusing. I lost my vision trying to make you unblurry. Good tute though.

[@ismailkabook9854]

Thanks for the helpful video. It worked 👍🏻👍🏻👍🏻

[@Izzyshandyprojects]

THANK YOU

[@santamulligan676]

Pulse charger any good

[@lucyferina]

I just did this with my lithium motorcycle battery and a jump starter box, I connected the jump starter box for about 2 seconds, the charger stated charging, I disconnected the jump starter box and now my battery is charging, now to try it with the regular battery which is older…

[@artimenthehusky5211]

Well. How'd it go?

[@HenryCalderonJr]

Thank you for the explanation

[@PaulHenreid]

you could start at minute 2 and cut the video length in half - more viewers would watch from beginning to end and your Search Engine Optimization would rise exponentially

[@sak1237]

No go for me. Boosted the dead battery, started the car, turned it off, left the good battery connected for 5 min, drove the car with the "dead" battery for 15 min, then re-connected the tender and it still shows "Full Charge". does this mean my tender is shot?

[@pauldsteele]

Works! Thank you!

[@CHiTO316]

I can jump start my motorcycle lithium battery which has 10.2v and use it the full day but if i don’t use the motorcycle for a couple of days it won’t turn on anymore

[@darkegress4392]

A 9v battery will trick the "smart" charger. Another tuber showed this and it works great.

[@HomeBatteryBank]

Interesting. I'll check it out! Thanks for letting me know!

[@Sylvan_dB]

Do you have an 18volt or 20volt tool battery? You can use that to "jump" your lawn tractor enough for the charger to recognize it as a 12v battery. Mind the polarity (plus to plus).

[@nikhayes3396]

I use a hobby charger that has a “pb” lead acid setting, and can change amperage from .1 to 6 amps solder up xt60 to alligator clamps.

[@stephentconnolly]

This worked. Thank you!

[@HomeBatteryBank]

Awesome! Happy to have helped :)

[@primafortune420]

Thanks, this worked.

[@spydermaaaan]

Thanks for the video. Was able to get my battery from 4v to 11v by using your method (but charger still reads same FULL on 4v and 11v). With meter you can watch volts drop down again. i have charger in repair mode now.

[@leesadler6234]

Absolute hero

[@rangergreen3995]

Good on ya! Very helpful!!

[@MelanatedHighPriestess]

Yesterday I got a 12v battery for my son's aventador lamborghini ride on car and i hooked it up properly and it worked he played in it for about an hour and it died. I put it on the charger and it's been charging 9 hours and it seems to be not charging. Granted charge time can be between 8-12 hours. But with it being hooked up to the charger for 9 hours it's not even giving any dim light at least min

[@Computahguy]

Thank you!

[@knowhowmedia5889]

Worked for me. Thanks.

[@charliecoronado4657]

Would.this work on a 12v lithium motorcycle battery?

[@nathanfenech9018]

didn't for me, but tf i was trying to charge it with a normal battery charger, not with one that has a specific setting. Once I started using the right charger it was fine.

[@aaronletchford]

Can I charge my electric scooter lipo pack

[@BenDunlop]

Thanks mate, lifesaver

[@mistajef]

Thanks for your vid, I appreciate it

[@jeffreydavidconner]

My battery was so dead the jumper battery pack I had would not turn the car over. Also so dead that my charger would not work. So I hooked up the jumper battery and then the battery charger. It recognized it as a battery and after 1 hour I disconnected the pack and the charger did the rest.

[@vladimircorsair]

that helped me a lot 🎉 thanks

[@nelsonwalker7105]

this was a helpful video thank you

[@CAROLDDISCOVER-1983]

Well I was looking to see if there's some way to fix my charger. The older chargers I could revive batteries that the store should not charge. Cuz I can hit it with various amount of charge. Then I can revive the battery.