Reviving dead batteries with a welder? - Defender Source
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  #1  
Old November 20th, 2008, 08:48 AM
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Paul Dandini
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Reviving dead batteries with a welder?

Ok - I am a building contractor and go thru cordless drill batteries every couple of years.
Right now I have like 6 sets of cordless drills with dead batteries - Porter Cable 8620, 8720,P, 8723, and a few older sets of Makita drills and saws.

New replacement batteries are expensive - like $55-$70 ea.

I did a search and see that one can revive NiCd batteries with a welder.

Has anyone here done this?

I'd like to try this - but don't want the battery to blow up.

Thoughts?

Thanks.
Paul

Here's a link

http://blog.wired.com/gadgets/2006/1..._revive_d.html

http://www.instructables.com/id/Revi...with-a-Welder/
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  #2  
Old November 20th, 2008, 10:27 AM
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Doug Crowther
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Dayum !

I have a couple dewalt 18v batterys around that I left in the quick charger too long and they came out dead- its got to be these crystals. In reading the responses it seems to work for the majority of posters. Seems like an automotive battery charger would be safer than my 135 amp mig.
Let us know what happens Paul.
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  #3  
Old November 20th, 2008, 11:43 AM
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I suggest you do the battery/mig welder thing in conjunction with the $69 chip dyno test. And I get first dibs on the video!
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  #4  
Old November 20th, 2008, 02:49 PM
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I was talking to a guy at Batteries Plus and he said sometimes they can revivie old cordless drill batteries. It seemed like the cost was pretty high for a non guaranteed job so I just bought a new one.
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Old November 20th, 2008, 03:13 PM
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Chris Snyder
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Go for it. Or convince someone else to try
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  #6  
Old November 20th, 2008, 04:43 PM
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Well I tried it with a car battery charger (thanks Doug) in the engine starter position.
Sa far it looks good - I did zap as per the blog to four of the 14.4 Porter Cable batteries.

Prior to this test two of the batteries would not hold any charge and showed just a couple volts.
The other two batteries indicated "weak battery" on the charger and both were around 5-6volts.

After zapping all four showed about 16volts. I inserted two batteries into two of the chargers - both showed a solid green light which indicates "fast charging" which is good.
I'll let these charge overnight and see if they work.
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Old November 20th, 2008, 05:43 PM
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Andrew Najarian
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Cool, keep us updated. What did you zap them with; did you use a welder?
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Old November 21st, 2008, 04:52 PM
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I used one of the 14.4 today and to my amazement the drill actually worked well and the battery felt strong.

I tried two 12v batteries and they did not hold a charge - I've got a co-worker w/ the same set-up so I'll try his charger to be sure.

I am not sure if this is a fluke - but it actually seems to work (for now..).
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  #9  
Old November 22nd, 2008, 02:19 AM
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In reading the responses it sounded like that if the car charger didn't work you need a higher amperage. Zap one with your mig !
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  #10  
Old November 22nd, 2008, 10:52 PM
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John B.
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Two years is a very long time for batterys that are used a lot. I'd be over the moon with that live. Buy new ones. They have a limited number of cycles before failure.
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