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Amazon.com: Game Boy Advance SP Replacement Battery Pack for GBA SP (packaging may vary) : Video Games
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Amazon.com: Gameboy Advance SP Battery: Gameboy SP Battery Replacement Lithium-ion Batteries - Compatible with Nintendo GBA SP Battery (3.7V 850mAh) : Video Games
Soldered Battery to a Gameboy Advance Game PCB so it can save, it still does not want to save. | TechPowerUp Forums
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