In Hardware

go on ebay and type in "NES drill bit" or "3.8mm bit" and you'll find what you're looking for

EDIT: i just tried "NES drill bit" and nothing showed up, but "3.8 mm bit" works just fine

Thanks for the tip. I have several other battery games that are probably going to die soon; strange that none of the Zelda ones have...

hey no problem!

Yes, the 3.8 is what ya need =)

Well, Nintendo made those suckers real good. They said in the manual they'd last only 5 years, but mine is still running. Those nintendo guys sue are smart.