Part2 - How to revive / rejuvenate / fix rechargeable NiCd battery for cordless drill

[nicholasbiblelife]

thank you

[dial2fast]

@nicholasbiblelife You are welcome. Thank you for watching!

[Tiny960]

This is very helpful information. I tried on two (2) of my 18v Dewalt batteries and one worked out very well, but not the other. Every time, I tries rejuvenate, I would get very wildly spark and stick to terminal, but it not do to the other battery. Any advise from any one would be greatly apprecaite. My batteries is sbout 3.5 years old.

[dial2fast]

@Tiny960 If this method does not work for the other battery then there may be other issues with the cells which cannot be repaired. It may be time to toss it.

[lawrencejbaker2000]

I can't believe how simple this is. I wonder how many times you can do this on Nicad batteries.

[hansonsux]

Also if you catch the crysal growth before the crystals get too big, you can reverse it by running the batteries through some charge/discharge cycles (how many depends on how big the cystals are).

[hansonsux]

Basically the crystals or dendrites grow to poke a hole in the separator, and short the cell to 0 volts. When you blow away the crystal, the damage to the separator is still there and so it creates the high self discharge. Also new dendrites will reform in short order so as soon as you leave the battery to discharge and it will short the cell again. Crystal growth can be caused by general neglect, such as leaving the batteries on continuous slow charge (overcharge).

[BrabusTKR]

hey buddy, so does the source have to be Ni-Cd?????

[dial2fast]

@BrabusTKR Source does not have to be NiCd.

[infinera06]

I just tried this. I didn't see any spark or zapping at all. Also tried it with a car battery...no zap either.

[TheReaLandwarrior4]

Know any way of fixing a NIMH battery i have like 3 or 4 good ones and 4 bad ones... i noticed it said not to try this so i figured i wont becuase i like my hands the way they are and i want the batterys lol

[Anglichanen]

Hi there!

Any idea how to repair a 24v battery? I have 1 good one and 2 dead ones

[robviolin1]

great info - thanks for sharing!!!

[hjchin]

Thanks for sharing this video, I have a question, sir what if I use 4pcs of 9v battery, series connection it which will give me 36 or more volts, then use your technique to zap it, will this ideal work? Thanks

[acitz7654]

after you rejuvenate the dead batt and let it cool then fully charge it. how long will it last for each use? Does it last long like a new batt or just last a few minute after each charge?

The problem with rechargeable batt is the older the batt the less juice it can hold after each fully charged.

[rickie5150]

At first I was skeptical, and now I'm a believer. I used 2 DeWalt 18V XRP packs that were just fully charged to Re-Ju-Ju my 4 Milwaukee 18V batteries. 2 of the M batteries were reading 0.00 on the voltmeter and my chargers would not even recognize the batteries, 1 was at 6.2, and the other at 17.6 . After the shock therapy, they are all reading in the 18 and 19 volt ranges. Now I just need to see how long the batteries will hold a charge.

[flushthatlooeuan]

Tried this and blew the fuck out one of my dewalt batteries 18v nicad

A big blue flash and blew the posative terminal right off the battery

[TrydisMikee]

Any idea as to why this works?

[dial2fast]

@TrydisMikee It's MAGIC!! jk....it has something to do with some kind of crystals being formed inside the cells which causes a short on each individual cell; this prevents the battery from holding a charge; by applying a high current surge you apply to it will literally fry those little crystals and allow the batttery to hold a charge again

[TheOcculus]

@TrydisMikee Look up Nickel Cadmium dendrite.

Lithium Ion and Nickel Metal Hydride batteries form dendrites too. Lead Acid battery dendrites are commonly called sulphation. I wouldn't recommend using this DIY technique on anything other than Ni-Cad.

There are high dollar industrial battery chargers for Hybrid transit coaches that incorporate high frequency voltage pulses an a "regeneration mode" to decrease or break up dendrite formation.

[ThePolarisdog]

Well, I tried it and it worked to the point where I can charge my 18v Dewalt, but when I hook my voltmeter up to it after charging and you can literally watch the voltage drop with no load except the meter. Thanks for the tip.

[ThePolarisdog]

I watched both videos and I just wondered how your batteries are holding up. Seems to be worth the time. So, how are they holding up?

[dial2fast]

@ThePolarisdog

I don't use my tools on a daily basis. I have since charged those batteries 3 more times and seems to hold the charge quite well. NiCd batteries will always have lmitations as far as memory effect and self drain, so time will tell as far as how long this fix will be good for.

[itchylipd]

@dial2fast

great vids thanks. clear presentation.

[cryingeva]

~Thank you for sharing the idea,this is very useful for me

[veterano130]

Magnify I had this problem with my drill but the drill is 24v. Thanks

[openmike78240]

awesome video, but how do i tell the positive post on my dewalt 12v drill battery, no markings

[dial2fast]

@openmike78240 - if there are no markings, the best way is to use a multimeter similar to what I did in my video. You don't want to guess when doing this.

[AintBigAintClever]

@openmike78240 if you're using identical batteries it won't matter. In the video it'd be two good batteries, right of left-hand one linked to left of right-hand one, then go from left of left-hand one to LEFT of bad one, and right of right-hand one tapped 8 times against RIGHT of good one. But as dial2fast says, if unsure use a multimeter. You'll probably want one anyway so you can take readings before and after.

[HaraldZ0r]

How long is the revived battery's lifetime?