Game Boy Advance Cartridge Battery Replacement - iFixit Repair Guide
How to make your old Game Boy as good as (or better than) new | Ars Technica
How to Change Your Game Boy Cartridge Battery (Quick & Easy) - Howchoo
my copy of pokemon silver cartridge shipped with a bad save battery. i'd only be able to get to the fourth gym or so before the batteries in my gameboy would die.
How to change a Game Boy game battery without soldering - Gamer By Mistake
Simple Trick For Replacing Game Boy Cart Batteries While Retaining Game Saves | Hackaday