Things You'll Need
Instructions
Remove all games from the system and remove the AC adapter. Turn off the system before attempting to remove the battery.
Plug the adapter's DC connector plug into External Extension Connector 2. It will match the slot.
Confirm that the battery is not charging properly. Leave it plugged in to recharge for an extended period, and then check to see how much power it has.
You must replace the battery when it can no longer hold a charge.
Remove the small Phillips head screw on the back of the Game Boy Advance SP.
Remove the battery cover and place it nearby. You will need it again after you replace the battery.
Take out the original battery, starting at the end with the single tab.
Insert the new battery, placing the end with two tabs in first. Close the compartment.
Reattach the battery cover.
Charge the battery.