Does this work？ Revive faulty battery of Black Decker by a dry cell, apply to Dewalt, Bosch, Makita 

What happened was there were two shorted cells in the pack. I used to have a capacitator discharge unit that would remove the shorts in some cells like this and then the charger generally would be able to recharge the whole pack to full voltage and not have any bad cells. The circuit was a very simple thing that charged a capacitator to about double the working voltage of the battery pack and then I would switch the circuit from charge to discharge through the battery. It sometimes required multiple cycles but was generally quicker and more reliable than disassembling the pack and trying to recover one cell at a time. I used this device on hundreds of 2 way radios that were used commercially and it extended the majority of the battery packs to double or triple the full life of the Nickel Cadmium battery packs and saved the company thousands of dollars yearly. Keep up the good work on helping recover battery packs.

I would never have thought of your method but I will try it. So the charger has a recognizable threshold, how cool. Thank you for your thorough and detailed presentation. I will try it.

I brought 18v 20v li-on battery, charger and adapter to fit my old nicad Black n Decker, adapter for old nicad Dewalt. The new li-on battery fits new Black n Decker, Stanley and now have brought angle grinder. WOW all my old power tools are re-lifed with li-on battery. I am cautious not to run li-on down too low before charging but a far superior battery that holds its charge ready to go.

You put a lot of work into your presentation and I thank you. I will give it a try.

Excellent thanks. I will give it a try soon.

This is very smart. I am not an electrical genius but I do know that the principle here is hooking the D cell in parallel which forces the current to equalize between the 2 batteries and flow into the dead cell. This re-activates the dead cell and then it will take a charge from the regular charger again. Normally, the batteries are all connected in series which has a different electrical flow pattern which just ignores dead cells. The trick is getting a parallel hookup, which does not drain into the other cells, there is no need to disconnect them from the pack. This is a great way to get dead cells up and running again. A bit tedious no doubt for some, but very interesting. Thanks.

Great video. I'm gonna have to dig out my old packs and try your method. Thanks for sharing. 👍

Wow! Very nice and helpful! Thanks! 😄

You have saved me the cost of replacing three 14 volt batteries, thank you

Wow. I didnt know that. Amazing!!👍👍👍

Very helpful

Interesting trick!

Thank Yoi Sir, For Sharing Your KNOWLEDGE, EXPERIENCE And YOUR TIME & EFFORTS! May Peace "BE" With You and Yours! Ameen!

Great tip! Thank you... but a fun fact: if you take it to Batteries Plus, they can replace those two bad cells (if your charger doesn't fix them) for you at a very reasonable price. 💖🌞🌵😷

Flattery gets me nowhere but you are smart man

great vid

Great video.You can also modify the pack using 18650 lithium cells

Super

Merci beaucoup pour cette information .

Nicely check step by step

Pretty ingenious.

How are you checking the individual batteries with out taking them out of the circuit? You are measuring the entire circuit!

The principle of ‘re-activating’ a ‘dead’ cell by transferring charge demonstrated here is the same principle used to dynamically balance the charging and discharging of battery banks during their use. Anyone interested in getting the manufacturers life charge/discharge claims of a single battery used with others in a battery bank will appreciate the utility of charge balancing circuitry. This is especially true for lead acid batteries used in solar power energy storage where under charging and overcharging phenomenon gets worse with each charge/discharge cycle. The battery bank will sustain damage if some batteries are discharged below the recommended lower limit, which is certainty without charge balancing , and also occurs when some batteries are overcharge and become overheated. Dynamic balancing circuits are relatively simple circuits that either use an extra battery or a capacitor or super capacitor in exactly the same manner as shown in this video with the ‘dry’ cell only done much faster and continuously for each cell one-at-a-time during the discharging or charging of the battery bank. A dynamic charge balancer will allow the same reliability of the entire bank as that claimed by the manufacturer for a single cell. It is a small wonder that they are not ubiquitous and well known within the solar community. Dynamic balancers should not be confused with static charging balancers:two very different fish.

Just take the pack down to Battery’s+. They replace the entire insides to work better than factory at a fraction of the cost of a new pack

i loged in just to like this video. What is the aperage of the ac charegr you used? i belive a universal 12v is good but will a 1a do the job or it's all about the time ?

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I can't any of these methods to work on my Craftsman 19.2 volt lithium batteries. Thoughts?

Jeez oh

Great.

There's another way..connect spades to two prong without dismantling..connect to another battry same voltage ⚡

Should I use 10dry batteries connect together to charger the dead battery without opening?

I have many B&D 12 volt batteries.My problem is that I don't have a charger. Do you know where I can purchase a charger like yours?

Interesting. In my work I have come across UK trucks with 24V systems using two 12V batteries in series. We needed 12V for a component and took power from one battery but had to fit a unit called a battery equaliser which took the same load from the other battery. Otherwise our load would slowly discharge its battery and the alternator would not catch it back up again. Seemed as if it stopped charging when the other battery was full regardless of the state of "our" battery. Maybe you have a similar situation with some batteries (maybe older than the rest) discharging faster and not getting fully charged?

c'est très bien

Try using a dumb charger to push a small amperage (12v @ 0.2amps) into the whole battery pack for about 2-3 hours. Then place it on the smart charger to complete the charge.

How do you revive a 40v battery?

Good Job !hHow did you manage to solder 2 wires to a "D" Duracell battery without sparking and discharging the Duracell battery?

How do you. Rejuvenate a Bosh cordless drill driver?

For to reattivate a 3.7V battery lithium what's the battery can i use? 2 battery of 1,5V in series?

I still have some ni-cad battery packs. Got to try this out. I wonder if this will work with lith-ion.

"last time was not good"...does that mean you had done this whole thing before, fixed them, and now you have to do it again? If so the batteries are crap. Or was it just pre prep work for the video. I want to know in case I do this and find my batteries end up crap again after a short time. Thanks.

let it fully charge after rejuvenating the lost cells, testing with a load will drain the dead cells first.

Is it working for car batteries???

How long before you have to go through this process again? Why can’t you just replace the faulty cells?

The only problem with doing this is that as soon as you apply any load it just dies really fast once the cells are damaged that's it

Idk, seems like it will die after a couple screws.

And there's free land in Manhattan.

So we're do I get the batteries from

Questions. (1) If you are reviving individual cells, why don't you unsolder the cells apart? When connected together, isn't the current going into all the cells? (2) Why use a single D cell? If there is not a lot of current involved, why not use an AC charger? (3) Wouldn't it make more sense to replace bad cells with new ones, since those bad cells will die again soon? Aren't you just delaying the inevitable? In my time as a TV engineer, I had to test and replace rechargeable cells in news photographer's battery packs. (Back when cameras were all analog and recorded on videotape.) If a cell went bad in those heavy battery belts, we threw it away and soldered in a replacement. That makes more sense than using electroshock to give a bad cell ten more minutes of life.

The pack is worn out. You might get it working a little, but it won't take a load like a good battery. Just like you can charge a old car battery up and get a few cranks. It isn't dependable power. Time for a new one.

I just plug a set of jumper wires from my good battery to the dead one, let it set for 5 minutes then stick it on the charger, works good everytime

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OMG

Just for clarity the battery used was not a dry cell but a Duracell.

That's quite a meter you have there. You get all sorts of voltage readings without the leads being connected to anything!

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I only see one battery made from 10 cells. Do you have 6 batteries in your car, or just one battery with 6 cells inside? It's like interchanging flour and bread.

I have done it on my drill. Save my money to buy new one😊

what happened if the battery charges for 48hours and red light is always on.....never charges....can i stil l save them?

Why not use a battery that's rechargeable, not Duracell!

Can the dji drone battery be done in that same way? Like to have your opinion.

I have tried it twice, and failed each time. Once they go dead, they never fully recover.

Do have to do what you are doing, every time I charge the battery pack.

There is a version 2.0 of upgrading a drill battery from a Lithium RC toy battery, please watch it, enjoy! Upgrade Ni-MH battery by a RC Lithium battery😀 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dFErn2DlS7k.html New video on rebuilding drill battery by Lithium cells ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Q_oimFUwfOY.html

And the other battery is a dry cell too🙄

what happens when you take a good working drill and attach it to a dead battery drill and then you use the good drill to spin the bad drill. when ever you force an electric motor to spin with out electric that motor is now generating power back into the cell battery i aint tried it.. but it makes scence to me..

It is a good video presentation except for his verbal redundancy perhaps due to limitations in language expression. I found myself filling in the blanks for him. It would have been better if he had read the steps of the process from a script to avoid the redundancy.

All batteries are wired together there isn't anyway to get the correct voltage unless you disconnect them from each other

he works on NMH battery - not on lithium !!!!!!!!!

I dead yet. You finish?

23 minutes? Could have done it in 5 min. I only made it through 3. LOL\

Is there a way you have tested, to restore a dead lithium ion batteries? They have a printed circuit and plenty of electronics embedded.. mine is 18v. Ryobi.

Wow, ok so thank you very much for the info! I’ve read pretty far down the comments and I feel like some people may be missing the point a bit. Yes, replacing the problem cells is of course the better idea, HOWEVER. . . Anyone that has used such a tool to make a living will agree that battery packs tend to leave you hanging at the worst possible moments. I couldn’t say hot many times I only needed to drill a couple more holes when my drill just dies and the backups haven’t charged at all. Amazon isn’t going to save me an extra trip the following day to finish that job, is it? And of course finding a store that sells anything affordable at the end of the workday during rush hour isn’t always even a possibility. Anyway, about voltage test accuracy questions, as long as all the individual batteries are connected in series, and disconnected from the load (drill) each battery is practically isolated from the others. If there was a charge indicator led or active Battery Management System in the circuit that allowed some current flow, his voltmeter will read everything just fine. Certainly “accurate enough” for what he is showing us anyway. Once again, thank you for posting this, I cannot wait to make good use of this knowledge next time I’m in a jam. And yes, I understand it may not work in some cases. But it just might work and save me or someone else a lot of time and money and stress! 👍🏼

there are only nine batteries

If you believe this works I got some oceanfront property in Arizona for you, and I love that cheesy $2 tester trying to act like you know what you're doing got everyone on here don't have a clue

Only if your desperately short of money

Doesn't even looks like it's been used before

Soon as yu put a load on whatever the batteries are running yu have same problem... Bad or worn batteries won't hold charge FACTS...

Seriously?... There stuffed old Ni-Cd cells which will NEVER hold a good charger ever again due the memory effect of there chemistry! Just replace them with 3 X 18650's & a bms & problem solved permanently for years!

That looks slow and tedious. Why not connect two 9v batteries to the battery without having to take the battery apart and charging each cell individually?

I’ve tried to recharge dead batteries like this, but these bad batteries do not hold charge for long. The battery pack will quickly run out after a few screws. The reason that these dead batteries have zero volts is because internally, there is a leakage ghat drains the battery. You can not really fix the dead ones. If there were still some residual voltage left, then you may recharge it and it will hold the charge.

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....or, just go buy another battery and get years of use out of it like your previous one. Who has time for this, haha.

video plot took too many edit , just made it not legit

The king of RU-vid fluff, everyone else does the video 6 to 8 minutes!

5 yrs old 🤣🤣🤣🤣 never been used not a scratch on it 🤣🤣🤣

Why would anyone buy Black & Decker products?

Wast of time, replace all with Li-ion pack

There's only 9 Batteries not 10!

Very annoyed 😠 explanation.

Personally I hate stupid battery tools! I have many, some are better than others but sooner or later you'll need to buy expensive battery replacement or new tools! Scam!!!

So much of this content is wasted. We don't need to see you opening it or watch you repeating measuring batteries

B.S.

The video dosnt need to be 23 minutes long I didnt Subscribe

How do you justify 23.21 minutes for this? I refuse to watch any videos that gives limited information longer than three minutes. Exploitative and stupid.