Amazon.com: Gameboy Advance SP Battery Pack, 850mAh Replacement Rechargeable Lithium-ion Battery + Tool Pack Kit Compatible with Nintendo GBA SP : Video Games
Gameboy Advance GBA USB-C Rechargeable Battery Pack – Genius Game Mods
Amazon.com: CENIFENX Gameboy Advance SP Battery, AGS-003 3.8V 850mAh Replacement for Nintendo Gameboy Advance SP Battery, with Repair Tool Kit : Video Games