It's not the prettiest look but I managed to get a 1600 mah rechargeable battery pack in my GBA 101 : r/Gameboy
4X 850mAh 3.7V Rechargeable Battery Pack For Nintendo GBA Gameboy Advance SP | eBay
Tomee GBA SP Rechargeable Battery Pack – A & M Digital Technologies, LLC
Tool Kit Compatible With Gameboy Advance Gba Sp, Rechargeable Li-ion Battery, 3.7v, 850mah Large Capacity - Digital Batteries - AliExpress
Amazon.com: Xahpower Gameboy Advance SP Games Accessories Kit, 1 Pack Charger and 1 Pack Battery Pack for Game Boy Advance SP Systems(GBA SP) : Video Games
Li-Ion Rechargeable Battery Replacement for Game Boy Advance SP | Hand Held Legend
Nintendo Game Boy Advance Rechargeable Battery Pack - Consolevariations
Rechargeable Battery Pack for Nintendo GBA SP® - XYAB
Source ZHAOLEAD AGS-003 850mAh 3.7V Rechargeable Li-ion Battery for Nintendo Gameboy SP GBA SP Game Rechargeable Battery Pack on m.alibaba.com
Intec Game Boy Advance Rechargeable Battery (Game Boy Advance) – J2Games
Rechargeable Battery Mod for Game Boy Advance - Funnyplaying
Nintendo Gameboy Advance OEM AC Wall Charger Adapter Set - Etsy
New 3.7V 850mAh BT-GH188 Replacement Lithium Battery For GBA SP Gameboy Advance SP Gamepad With Screwdriver Rechargeable Battery
Gameboy Advance GBA USB-C Rechargeable Battery Pack – Genius Game Mods
Tomee GBA SP Rechargeable Battery Pack - Walmart.com
Amazon.com: Gameboy Advance Rechargeable Battery 1500mAh USB-C Lithium LiPo Mod for Nintendo GBA / AGB-001 (Indigo) : Video Games
Finished my homemade rechargeable battery pack! : r/Gameboy
USB TYPE C RECHARGEABLE BATTERY GAME BOY ADVANCE MOD from Retro Modding | Retro Renew - YouTube
CleanJuice Game Boy Advance Rechargeable Battery Pack | RetroSix
GBA Game Boy Advance 1500mAh USB-C Rechargeable Battery Mod – Retro Game Repair Shop LLC
GameBoy Advance Rechargeable Battery Mod! - YouTube
Techinal Tool Kit Compatible with Gameboy Advance GBA SP, Rechargeable Li-ion Battery, 3.7V, 850mAh Large Capacity - Walmart.com
Pre Order Shipped the 26 August. NEW Battery Mod Usb-c Gameboy - Etsy
Micro USB Rechargeable Battery Pack for Game Boy Advance — Retro Modding
Gameboy Advance Rechargeable Battery Mod 1500mAh Li-ion USB-C for Game Boy GBA | eBay
GBA Game Boy Advance 1500mAh USB-C Rechargeable Battery Mod – Retro Game Repair Shop LLC
GBA Li-Ion Rechargeable Battery USB-C Module – FunnyPlaying
