Use a coin to turn the battery locking screw 90 degrees clockwise. Lift the battery out of the computer. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-1-5-GHz-Airport-Extreme-Card/221/all#s796 Flip down the door on the right side of the battery compartment. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-1-5-GHz-Airport-Extreme-Card/221/all#s799 Use a spudger or flathead screwdriver to disconnect the Airport antenna from the card. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-1-5-GHz-Airport-Extreme-Card/221/all#s800 Grasp the plastic tab and pull the card out all the way. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-1-5-GHz-Airport-Extreme-Card/221/all#s801