Remove the two 5mm Phillip's screws in the bottom right and the top left corners of the back panel.

Remove the 3mm Phillip's screw that is near the bottom right corner.

Loosen the Phillip's screw that is near the center until the spring pops up, but do not remove it.

Detach the back case panel by sliding it away from the battery slot and lifting it out of place.

When reattaching the back panel slide it towards the location of the battery instead of away from it while also applying pressure downwards.