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Installing MacBook Unibody Model A1278 Battery Installing MacBook Unibody Model A1278 Battery Parts relevant to this guide MacBook Unibody (Model No. A1278) Battery Step 1 - Access Door 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. Step 2 The access door should now be raised enough to lift it up and out of the Unibody.