Installing MacBook Core 2 Duo Battery: Step 1 Use a coin to rotate the battery-locking screw 90 degrees clockwise. /Guide/Repair/MacBook-Core-2-Duo-Battery/510/all#s2425 Installing MacBook Core 2 Duo Battery: Step 2 Lift the battery out of the computer. /Guide/Repair/MacBook-Core-2-Duo-Battery/510/all#s2426