You decide to fix something on your house, so you get out your tools and begin. You put a drill bit in your cordless drill and find the battery is dead. You put the battery in the charger and the red light comes on indicating "replace the battery".
Damn, now you need to buy a new one to complete your task - or do you?
Most cordless tool batteries are NiCd. NiCD batteries develop internal shorts that usurp their power causing them to die, be weak, or not charge. You can resolve this issue by zapping the cells in the battery that are shorted to remove the short.
If you want details about how it is done then check out the "Battery Resurrection Guide" at www.batteryresurrection.com
Battery Resurrection is a registered trademark of Unique Dynamics, Inc.