Things You'll Need
Instructions
Use the needle-nose pliers to unscrew the screw on the back of the "Crystal" cartridge. Turn the needle-nose pliers counter-clockwise slowly until the screw comes off.
Slide the front of the cartridge down, exposing the circuitry located within.
Locate the CR2032 battery in the cartridge. This battery is round, silver and easy to locate in the circuitry.
Use the soldering iron to melt the tab connecting the battery to the circuit board. Once the tab has melted, carefully use the pliers to remove the old battery.
Place the new battery, positive side down, into the circuitry where the old battery was located. Use your adhesive tape to tape the battery down where the tabs used to be.
Slide the front of the cartridge back up to close the cartridge. Replace the screw on the back of the cartridge.
Insert the cartridge into your GameBoy Color. Save your game, turn off the cartridge and then turn it back on to verify the save is still there. This means that the battery has been successfully replaced.