Cordless Telephone/Answering System User's Manual
Getting started
Handset battery installation & charging
Install the battery as shown below. After installing the battery, you can 
make and receive short calls, but replace the handset in the charger when 
the handset is not being used. For optimal performance, charge the handset 
battery for at least 16 hours before use. When fully charged, the handset 
battery provides approximately five hours of talk time or three days of 
standby time. 
If the battery is depleted, it may take approximately four minutes to charge 
the handset before it can resume screen display. The screen will continue to 
display LOW BATTERY until the battery has charged for approximately one 
hour.
THIS SIDE UP
WARNING:DO NOT BURN OR
PUNCTURE BATTERIES
MADE IN CHINA
Battery Pack
BT5633/BT6823
3.6V 550mAh Ni-MH
THIS SIDE UP
WARNING:DO NOT BURN OR
PUNCTURE BATTERIES
MADE IN CHINA
Battery Pack
BT5633/BT6823
3.6V 550mAh Ni-MH
THIS SIDE UP
WARNING:DO NOT BURN OR
PUNCTURE BATTERIES
MADE IN CHINA
Battery Pack
BT5633/BT6823
3.6V 550mAh Ni-MH
THIS SIDE UP
WARNING:DO NOT BURN OR
PUNCTURE BATTERIES
MADE IN CHINA
Battery Pack
BT5633/BT6823
3.6V 550mAh Ni-MH
Plug the battery 
securely into the plug 
inside the handset 
battery compartment, 
matching the color-
coded label. 
Place the battery in the 
compartment with THIS 
SIDE UP facing up as 
indicated.
Align the cover flat 
against the battery 
compartment cover, 
then slide it upwards 
until it clicks into place.
Step 3
Step 2
Step 1
IMPORTANT INFORMATION
Use only the battery supplied with this product. To order a replacement or spare 
battery (AT&T model 27910, part number 89-0099-00-00) or equivalent, visit our 
website at www.telephones.att.com, or call 1 (800) 222-3111. In 
Canada dial 1 (866) 288-4268.
Charge the handset by placing the handset face out in the 
charger. The CHARGE light will be on when the handset is 
charging.
8
Step 4










