Poryhedron, I think some GBA games are immune to this problem because they use some kind of flash memory chip that doesn't need a battery.

dudestorm, that was amusing seeing how you guys ripped the cartridge to shreds to get inside. It looks like there was some solder holding the tab to the battery. How did you get it to stick to the battery? Do you have a really powerful soldering iron? Whenever I tried to solder anything to a battery, it would never stick together.

wshep, thanks for posting that link. I had been wondering what those screw drivers were called. I was thinking of grinding a nail down to the shape of one of those triwing drivers that you use to open up a GBA. Now I just need to decide whether it is worth the risk to attempt any modifications.