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PSA: If you're going to replace the battery in an old cartridge, do it properly. With solder. : r/retrogaming
Game Boy Color Battery Replacement - iFixit Repair Guide
How to replace a GameBoy cartridge battery without losing saved data - Gamer By Mistake
How to replace a GameBoy cartridge battery without losing saved data - Gamer By Mistake
Save Battery Replacement Service – Game boy, Pokemon, N64 SNES – GeekGearStore
How to Change Your Game Boy Cartridge Battery (Quick & Easy) - Howchoo
This Game Boy doesn't need batteries, but shuts off every 10 seconds - The Verge