One of the things that can go wrong with rechargeable batteries is that as the metal plates out upon recharging it tends to form, well , stalagmites (for lack of a better term). Eventually, these stalagmites can bridge two plates, rendering that cell useless. Prevention: Completely discharge the battery before recharge (can be a real drag and really inconvenient). Cure (Theoretical): Get a really big capacitor, like the kind you might have found in a Who tour amp, charge it up, then discharge it to the battery. I say "theoretical" because we tried to do this in my high school electronics class, with very poor results. This doesn't mean it won't work; the battery/capacitor we were using might have been defective for other reasons, or whatever. Good luck, Eric. PS. You could always find the Voltage/amp specs for the motor in your drill and make your own battery setup.
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