The battery is most likely dead Gerald.
If its a Ni-cad, they're especially prone to the memory effect if they're not charged correctly, they slowly lose their ability to charge, plus they've only a finite life anyway. Sadly there's probably millions of functional drills out there but they're useless because the batteries are so expensive to replace.
Sorry, no idea where you'd get a new one.
Colin W
September 2011
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