Installation and setup
After installing the battery, you may be able to make and receive short calls. 
For best performance, place the handsets in the telephone base or the charg-
er and charge for 16 hours before use. 
You can keep the battery charged by returning the handsets to the telephone 
base or the charger after use. When the battery is fully depleted, a recharge 
takes about 12 hours. The average talk time on a fully charged battery is 
about eight hours, and the standby time is approximately five days. Actual 
battery life depends on usage conditions and age of battery.
Caution: Use only the supplied 
rechargeable battery or replacement 
battery (model 27910, part number 
89-0099-00-00) or equivalent. To 
order a replacement battery, visit our 
website at www.telephones.att.com or 
call 1 (800) 222-3111; in Canada, call 
1 (866) 288-4268.
NOTE: Under normal conditions, 
the battery should last around one 
year. This may vary depending on 
usage.
1. Insert the plug as indi-
cated. Be sure to securely 
insert the plug, making sure 
matches the color-coded 
label inside the battery com-
partment.
3. Slide the battery 
compartment cover 
up until it clicks.
2. Place the bat-
tery pack and 
wires inside the 
compartment.
Choose a central location close to a telephone jack and a power outlet not 
connected to a wall switch. The telephone base can be placed on a flat sur-
face or mounted on a standard wall plate. For optimum range and better 
reception, place the telephone base in a high and open location.
Avoid placing the telephone base too close to:
• Communication devices such as: personal computers, computer routers, tel-
evision sets, VCRs, wireless routers (wireless broadband, wi-fi, or 802.11) or 
other cordless telephones.
• Excessive heat sources.
• Noise sources such as a window with traffic outside, motors, microwave 
ovens, refrigerators, or fluorescent lighting.
• Excessive dust sources such as a workshop or garage.
• Excessive moisture.
• Extremely low temperatures.
• Mechanical vibration or shock such as on top of the washing machine or 
work bench.