So I unscrewed the cartridge apart and found the circuit. I see the battery already there, in between two metal tabs that are soldered onto the circuit. The problem is that I don't know how to solder so am I suppose to remove the battery without removing the metal tabs or remove them all together? I'm going back to college soon and will hopefully find a metal shop with a soldering tool instead of having to buy one. EDIT: Oh right, I'm doing this because I think my battery is dead. Most game saves won't stay on my microsd for more than a day so I suspect that it's dead through reading a couple of threads on gbatemp and cyclods. Is there another method that would definitely tell me if the battery is dead (such as loading a specific game that will tell me that)?