You will need a small Phillips head screw driver and about 5 minutes.
1. Unplug wall plug (normally located directly below the panel)
2. With the screw driver loosen the set screw that is located underneath the panel in the middle
3. Remove panel from wall by pulling bottom corners towards you
4. Use white strap to hang panel from the mounting bracket
5. Unplug battery from panel
6. Remove battery from panel by sliding it left towards the edge of the panel and popping it out
7. Insert new battery and plug into panel (ensure black wire cover is tucked into the panel so panel can close properly)
8. Replace onto mounting bracket and tighten set screw
9. Plug wall plug back into the outlet
