Just did some research and found out the cause of failure of some early releases of 28v and 36v dewalt packs. Apparently the BMS (battery management system) did not go to "sleep" mode properly after the tool was no longer being used, drawing enough current to overdischarge the battery. If you have packs from 2006, DO NOT LEAVE them in tools, take them off at the end of the day and recharge them ASAP.
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