How do I replace a dead battery inside of a battery-save Nintendo cartridge?
First remove the screws on the back of the cartridge (see below on how to obtain the special tool you need to do this), take the casing off, and pry the dead battery out while making sure not to destroy its holder. Next purchase a new 3 volt battery (part #’s CR2032, DL2032, & ECR2032 will all work) and affix it into the holder slot by soldering or taping. Carefully screw the case back on and your new battery should last you years to come.
