Installing iBook G4 12" 800 MHz-1.2 GHz Battery: Step 1 Use a coin to rotate the battery locking screw 90 degrees clockwise. /Guide/Repair/iBook-G4-12-Inch-800-MHz-1-2-GHz-Battery/153/all#s522 Installing iBook G4 12" 800 MHz-1.2 GHz Battery: Step 2 Lift the battery out of the computer. /Guide/Repair/iBook-G4-12-Inch-800-MHz-1-2-GHz-Battery/153/all#s523