The first step will be to remove all the screws from the back cover of the device. Then we will remove the back cover. Next, we will remove the screw holding the battery in place. Once that is complete the battery will be unplugged and removed. These steps will be repeated in reverse to put everything back together.
Remove all 18 marked screws (2.12 mm) using a Phillips #1 Screwdriver.
Use the spudger to slowly work your way around the perimeter starting at the marked location to pop the bottom cover off.
Remove the 1 marked screw (3.3 mm) holding the battery in place using a Phillips #1 Screwdriver.
Unplug the marked plug from the motherboard and this will complete the removal of the battery.