This keeps the RAM levers out of the way of the battery and secures the hard drive.
Use a coin or spudger to rotate the battery-locking screw 90 degrees clockwise.
Lift the battery out of the computer.
Unscrew the three evenly-spaced Phillips screws from along the rear wall of the battery compartment.
Rotate the L-shaped memory cover so it clears the battery compartment opening and lift it up and out of the computer.