You'll be back up-and-running quickly. You do need soldering skills to replace these, it is quite a tricky job to do.
Game Boy Advance Battery Terminal Contacts PCB Motherboard
BATTERY COVER FOR NINTENDO GAME BOY POCKET, BATTERY BACK COVER, CLEAR
BATTERY COVER FOR NINTENDO GAME BOY COLOR, BATTERY BACK COVER, TURQUOISE
BATTERY COVER FOR NINTENDO GAME BOY ADVANCE, BATTERY BACK COVER, WHITE
BATTERY COVER FOR NINTENDO GAME BOY POCKET, BATTERY COVER, CLEAR PURPLE
Nintendo Game Boy Advance Battery Back Replacement Cover White
