6
Getting started
IMPORTANT INFORMATION:
Use only the supplied rechargeable battery or replacement battery (model 27910). To order, visit 
our website at 
www.telephones.att.com, or call 1 (888) 915-2007. In 
Canada, dial
 1 (866) 288-4268.
Press down the tab to open the battery compartment cover.1.
Place the battery in the compartment. 
Make sure the supplied battery with 
the label THIS SIDE UP faces up as 
indicated.
2. Align the cover flat against the 
battery compartment, then press 
down until it clicks into place.
3.
Backup battery installation
Install the backup battery as shown below. In the event of a power failure, 
the charged backup battery allows the deskset to operate. Plug in the AC 
power adapter into the power jack at the bottom of the deskset to charge the 
backup battery.