Anyone Rebuilt Own 18V Batteries For Cordless Tools? - Tools - DIY Chatroom Home Improvement Forum

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Old 11-01-2011, 01:15 PM   #1
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Anyone rebuilt own 18V batteries for cordless tools?

Heard there isnt much too inside of the battery of a 18v cordless DeWalt battery(as an example). Just a bunch of 1.5 volt batteries soldered, wired together to get to 18 volts.

Heard a battery store could renew them better and cheaper than new. Just got back from one and they wanted 65 bucks to do it and had over the counter replacements with more warrenty for $60,,,but not quite as many _______(forgot what they called it) said if they rebuild its 2100 otc is 2000 and new is only like 1800milliwatts ,,,,,,maybe????????

I know with solar panels you can assemble them yourself for about 10 cents on the dollar of buying one,,,thought should be able to buy batteries for this app. and fix yourself for MUCH less. Anyone done this,,or know someone else that did??


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Old 11-01-2011, 01:52 PM   #2
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my son fixed a few cordless batteries at his last job. he took apart the battery and got the number off of the cells and searched the internet for the correct ones. i think most were under 5-6 dollars a piece. I was gonna do the same for my wife's laptop battery but the cost of the new cells was as much as i could get a new battery for from aftermarket manufacturers. dell wanted 150.00 for one.


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Old 11-01-2011, 04:44 PM   #3
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I have heard that Radio Shack has the little batteries for replacement.
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Old 11-01-2011, 06:03 PM   #4
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I have had batteries plus rebuild for my snap-on tools for about 50, over 100 off the tool truck. And they seem to hold a charge longer.
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Old 11-05-2011, 07:40 AM   #5
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I took my 14v Milwaukee drill battery to one of those battery stores a few years ago and what i got back from them barely lasted a few months. I would certainly try and do it yourself. All the information you need to do it is available through Google and right there in front of you when you open the battery up, I bet.
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Old 11-05-2011, 09:46 AM   #6
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I am in the process of doing this now. Here are some pics of the inside of a 18V Dewalt. It looks like you have to desolder the top and bottom plates. Then figure out what type of battery you have. Get replacements solder back together. Take a pic to remember the battery configuration. Seems simple enough.
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Old 11-05-2011, 10:00 AM   #7
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Not sure that it is worth the hassle. Those Dewalts can be had for $50 each all day long. Probably not safe to mess with if you are not absolutely certain of your skills either,
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Old 11-05-2011, 10:06 AM   #8
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Picture with the tape removed.
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Old 11-06-2011, 12:10 PM   #9
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I recently purchased a couple from
The 9.6v I needed seemed like a deal at $25. It looks like the 18v are $46.
Buying these was cheaper than rebuilding at the local battery store.
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Old 11-17-2011, 03:48 PM   #10
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While you could solder those together, those are actually welded on. DeWalts use sub-C size batteries in their NICads. The XRP packs have around a 2400mAh cells, where the basic batteries are 1200mAh. If you want to be on the cheap side you can go thru cell by cell and only replace the bad batteries. Only takes a couple bad cells to make a battery suck! Only hard part is getting a good solder joint.


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