AT&T E3813B Quick Start Manual Download Page 3

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Installation and setup

After battery installation, the battery may have enough charge to allow some 
calls. For best performance, place the handsets in the telephone base or the 
charger and allow to 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.

2. Place the battery 

and wires neatly inside 

the compartment.

Caution:

 Use only the supplied rechargeable battery or replacement battery (model 27910, 

part number 89-0099-00-00). To order a replacement battery, visit our website at  

www.telephones.att.com or call 1 (800) 222-3111. In Canada dial 1 (866) 288-4268.

4. The battery may have 

enough charge to allow 

for some calls. For best 

performance, place hand-

set in telephone base or 

charger to charge for at 

least 16 hours before first 

use.

1. Plug the battery securely 

into the plug inside the 

handset battery compart-

ment, matching the color-

coded label.

3. Slide battery compartment 
cover towards the center 
until it clicks into place.

To replace the battery, 
press in and push outward 
on the tab to open the bat-
tery compartment cover. 
Lift out the old battery 
and disconnect it from the 
compartment. Follow the 
instructions on this page to 
install and charge the new 
battery.

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