Identify that the battery is visible once the back cover has been removed, and locate the battery in the rectangular-shaped top half of the device.

Pry apart the battery and back of the device using the flat end of your spudger tool or using your finger if you do not have a spudger.

Your battery has a specific orientation resembling a horizontal rectangle. Make sure the gold colored leads are aligned with the gold colored strips on your battery before reassembling.