UTStarcom Sidekick ID Reference Manual page 18

7 Once the bumpers are securely fastened, replace the end-cover by
first lining up the two tabs, then pushing the cover into place. Make
sure the tabs are seated correctly.
8 Replace the battery and back cover as described in "Removable
Battery", steps 4 and 5 on page 15.
9 Your device will power on once you insert the battery.
!
Due to the nature of the bumper design, the materials used, and their
replaceable nature, the bumpers are not covered by the device warranty.
18 Device Basics