Unscrew the four outer 1.0 mm screws with a Phillips-Head screwdriver.

Screws will be magnetized in position and will require the use of tweezers to be removed.

Push down gently on the battery case cover and slide it in the direction the arrows indicate. Remove the batteries.

Unscrew the 0.6 mm screw located in the center of the battery case.

Keep the 1.0 mm and 0.6 mm screws separate from each other for reassembly.