Get the replacement battery (CR2032 with tabs) for Game Boy® games.
Game Boy Cartridge Battery Replacement - iFixit Repair Guide
Replacing the battery in a Game Boy cartridge
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Game Boy Cartridge Battery Replacement - iFixit Repair Guide
How to Change Game Boy Cartridge Battery : 8 Steps (with Pictures) - Instructables
How to Change Game Boy Cartridge Battery : 8 Steps (with Pictures) - Instructables
Get the battery (CR2032 with tabs) for Game Boy® games.
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Nintendo Gameboy Game Cartridge Battery Replacement –