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Amazon.com: 12 Pack CR2032 Batteries with Tabs CR2032 tabs Replacement Save Battery for Game Boy, GBA, and Color, NES, SNES, and N64 Games : Video Games
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nintendo - Do the cartridges lose your saved games without batteries? - Retrocomputing Stack Exchange
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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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