Cisco 8821 Administration Manual page 42

Install the Phone Battery
Phone life and functions could be compromised if:
Caution
• The battery cover is not closed properly
• The rubber gasket on battery cover is poorly maintained
• The rubber gasket on battery cover is damaged
• The phone is dropped on a hard surface on a regular basis
Procedure
Step 1 Remove the cover from the battery compartment.
a) Push the locking catch to the left to release the cover.
b) Lift and remove the cover of the battery compartment.
Step 2 Install the battery.
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager
32
Phone Setup