The control module in my Dewalt 28 volt LiPO4 battery is heating up.
The Background:
I have a nonfunctioning Dewalt 28 volt battery pack. Did not want to buy a "New" one since they stopped making these several years ago. So anything on the market is old already.
I tried 2 battery rebuilders and both said they did not work on this battery.
After reading a post I opened the pack, tested the 8 batteries, and found that only one was bad (the battery to which the thermister is connected).
Got online and ordered the single battery and installed it. I had to add and extension on one wire because it was too short. I used 18 gauge wire, soldered it, and covered with shrink wrap tubing.
I had 2 incidents where I mistakenly touched the terminal and the body of the battery with the soldering iron. After that, I covered the new battery with electrical tape.
When I reassembled the unit, the control module, for lack of a better term, got hot over the course of several minutes. The batteries remained cool to the touch.
I immediately took the unit apart, checked the work I had done, and reassembled. Same thing happened. Redid one solder joint, same result. I am experienced at soldering so think I have good joints. If I had a cold joint, there would be no current to the control unit.
My question is: has anyone else experienced this? I fear the battery pack may be a goner.
I would appreciate any insights.
Thank you.
Wayne
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