AT&T TL74258 - 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
handset, the call will continue (at the lowest volume) until you hang up; while
a call on the cordless handset or speakerphone will disconnect immediately.
During a power failure, you can still make and answer calls using the corded
handset. However, you cannot make or answer calls on the cordless handset
or speakerphone.
If power resumes while you are on a call, it will continue and the telephone
will reset once you hang up.
Follow the steps below to install backup batteries.
Battery compartment tab
BASE
CHECK AC POWER