Step 1 — Lower Case Remove the following 10 screws securing the lower case to the MacBook Pro 13″ Unibody:Seven 3 mm Phillips screws.Three 13.5 mm Phillips screws.Step 2
Slightly lift the lower case and push it toward the rear of the computer to free the mounting tabs.
Step 3 — Battery
For precautionary purposes, we advise that you disconnect the battery connector from the logic board to avoid any electrical discharge. This step is optional and is not required.
Use the flat end of a spudger to lift the battery connector up out of its socket on the logic board.