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On old NES games with save batteries, why did you have to hold down the reset button while turning off the NES? - Quora
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How do game save batteries work for NES, SNES and Gameboy games? - Quora
Super Nintendo Cartridge Battery Replacement Guide & SNES Cart Battery
Game Save Battery Install Service SNES NES SEGA GameBoy – RetroFixes
List of NES games with save batteries
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Preservation project. I'm upgrading old NES and SNES cartridges with better eprom batteries and battery holders. You'll lose your save games with the mod, but get years more use from old games.
On old NES games with save batteries, why did you have to hold down the reset button while turning off the NES? - Quora
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NES battery replacement for games that stopped saving - Howchoo