You need a Gameboy AdvanceSP Battery? These batteries are also called GBA SP Batteries and they're essential to having a Gameboy Advance SP session. GBA SP Battery replacement is simple and will fix your Gameboy Advance if it shuts off at random or doesn't start.

If your Nintendo Gameboy Sp is a handheld marvel, you will understand the importance of changing the battery once or twice a year. This is to prevent damage to the internal circuit boards and to keep a GBA working like new.

*New Gameboy Advance SP Battery in bulk pack. GBA SP screwdrivers are sold separately.