It's not the prettiest look but I managed to get a 1600 mah rechargeable battery pack in my GBA 101 : r/Gameboy
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GBA Game Boy Advance 1500mAh USB-C Rechargeable Battery Mod – Retro Game Repair Shop LLC
GBA Game Boy Advance 1500mAh USB-C Rechargeable Battery Mod – Retro Game Repair Shop LLC
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Amazon.com: Gameboy Advance Rechargeable Battery 1500mAh USB-C Lithium LiPo Mod for Nintendo GBA / AGB-001 (Black) : Video Games
Rechargeable Battery Pack for Nintendo GBA SP® - XYAB
