GBA:Battery Mods

Game Boy Advance
The Game Boy Advance has lithium battery pack mods that can be dropped into the battery compartment without any soldering, allowing you to power the Game Boy without relying on AA batteries. For OEM/stock shells, the battery compartment will need to be modified to trim off the plastic separator sitting in the middle. Pre-modded IPS shells usually already have this trimmed but not all of them do. A cut-out for the USB port will also need to be made on the battery cover, unless one is purchased pre-cut.

Note that the battery run-time using a battery pack mod will likely be lower than that of rechargeable nickel-metal hydride batteries (Ni-MH).

Game Boy Advance SP
The Game Boy Advance SP already includes a rechargeable battery that can be replaced by unscrewing the battery cover on the back of the SP, removing the current battery, and dropping a new one in. Mahko's battery is the only one that requires soldering as the battery needs to be connected to the battery terminal board which then connects to the SP terminals.