Remove the seven 9.3 mm T8 Security Torx screws securing the rear case to the front case.
Insert a plastic opening tool between the front and rear cases along the left edge of the controller. Rotate the tool toward the front of the controller to pry the two cases apart.
Grasp the controller by the battery compartment and the headphone jack. Lift the battery compartment away from the headphone jack, separating the rear case from the front case and logic board.