AT&T TL74458 - Manual (Page 10)

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2. Press the tab on the base battery
cover (on the bottom of the
telephone base) toward the cover
and swing open the battery door.
3. Insert three new AAA alkaline
batteries, matching the + and
- signs engraved on the telephone
base.
4. Replace the backup battery cover
onto the telephone base, the
cover will click into place if it is
attached properly.
During a power failure, if the backup batteries are installed, the telephone
base will display
CHECK AC POWER.
1. Make sure no line cord is
connected to the telephone base.
NOTES:
1. With backup batteries, the base ringer and the handset volume will be at the lowest settings.
2. We recommend changing the batteries every nine months.
Getting started
Backup battery installation and use (not included)
In the event of a power failure, your telephone can still operate with
limited functions if there are backup batteries (purchased separately) installed
in the telephone base. If a power failure happens during a call on the corded
or cordless handset, the call will last until you hang up. You can also make or
answer calls using the corded handset. However, you cannot make or answer
calls on the cordless handset during a power failure.
If power resumes while you are on a call using the backup batteries, the
call will be ended, so you may want to disconnect the AC power cord before
placing a call when there is no AC power. Be sure to reattach the AC power
cord when AC power resumes or when you are done with the call.
Follow the steps below to install backup batteries.
Battery compartment tab
BASE
CHECK AC POWER