How to revive a dead battery

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Forum topic by GMman posted 12-27-2010 06:04 PM 938 views 1 time favorited 4 replies Add to Favorites Watch
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3902 posts in 3120 days

12-27-2010 06:04 PM

Topic tags/keywords: tip

introRevive Nicad Batteries by Zapping with a Welder
Nicad batteries often die in such a way that they won’t take a charge and have zero voltage. This usually means they’re shorted out by crystal dendrite growth.

Here’s a method of bringing them back to life by zapping those shorted crystal dendrites away with too much current and/or voltage. We’ll use a welder as a power source. You could also use a car battery, a DC powersupply, or almost anything with some voltage. Charged-up capacitors are popular for this because you can get a very fast pulse out of them and still limit the power. it’s a lot safer that way. Speaking of which,

4 replies so far

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2200 posts in 2459 days

#1 posted 12-27-2010 06:05 PM

What is the proceedure?

-- If you don't work, you don't eat!.....Garland, TX

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3902 posts in 3120 days

#2 posted 12-27-2010 06:09 PM

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470 posts in 2383 days

#3 posted 12-27-2010 08:49 PM

t’was posted here before:

i tried it with succes on 2 bosch drills, and no succes on a makita drill

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3902 posts in 3120 days

#4 posted 12-27-2010 09:56 PM

I tried it with an old 9V cordless that I had put away because the 2 batteries were dead I used a 12V battery charger and it worked.
My old drill is back in service.
It makes a good driver.

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