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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.
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NES Zelda II Cartridge Battery Holder Install. Cheap, Easy, & Neat. : 6 Steps (with Pictures) - Instructables
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So I Felt Like Playing My Legend of Zelda NES Cart But the Battery Was Dead.. : r/gaming
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NES battery replacement for games that stopped saving - Howchoo
Nintendo Cartridge Onboard CR2032 Battery Holder. : 5 Steps - Instructables
ATA 70492 Gate Battery Back Up Kit For NES-500/NES-800 – Remote Pro
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NES battery replacement for games that stopped saving - Howchoo
Custom Kirby's Adventure With Battery Upgrade Nintendo NES | eBay
How reliable is changing the battery in SNES and NES cartridges to not lose saved games? - Quora
Legend of Zelda (NES) Battery Fix - YouTube
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CR2032 Battery Service - Album on Imgur
