With the case closed, place the Unibody top-side down on a flat surface. Depress the grooved side of the access door release latch enough to grab the free end. Lift the release latch until it is vertical. /Guide/Installing-MacBook-Pro-15-Inch-Unibody-Late-2008-and-Early-2009-Battery/819/all#s4447 With the case closed, place the Unibody top-side down on a flat surface. Depress the grooved side of the access door release latch enough to grab the free end. Lift the release latch until it is vertical. /Guide/Installing-MacBook-Pro-15-Inch-Unibody-Late-2008-and-Early-2009-Battery/819/all#s4447 The access door should now be raised enough to lift it up and out of the Unibody. /Guide/Installing-MacBook-Pro-15-Inch-Unibody-Late-2008-and-Early-2009-Battery/819/all#s4448 Be sure the access door release latch is vertical before proceeding. Grab the translucent plastic tab and pull the battery up and out of the Unibody. If the latch is depressed it will lock the battery in place. /Guide/Installing-MacBook-Pro-15-Inch-Unibody-Late-2008-and-Early-2009-Battery/819/all#s4449