After removing all 16 screws you can begin the process of removing the battery housing panel.

You will need to use the thinner plastic prying tool to slowly outline the seem of the case starting from the top (near the camera).

Try to be careful around the side buttons as the plastic is weakest there.

After the top half of the case has been opened insert the thicker prying tool to keep the case open. This will help as the battery and battery housing have a suction cup like action that keeps them from separating.