Locate the battery release tab on the underside of the G4. Slide the battery release tab to the left and lift the battery out of the computer. /Guide/Installing-PowerBook-G4-Titanium-DVI-Battery/628/all#s3310 Locate the battery release tab on the underside of the G4. Slide the battery release tab to the left and lift the battery out of the computer. /Guide/Installing-PowerBook-G4-Titanium-DVI-Battery/628/all#s3310