AT&T 5840 - Manual (Page 65)

Spare Battery
You can buy a spare handset battery (AT&T Battery 2401, SKU# 91077,
sold separately) and keep it charged in the base at all times.
In the event of a power failure, a fully charged battery in the spare
battery compartment will allow you to make and receive calls from the
cordless handset only for up to 2
1 /
2
hours.
The spare battery will fully charge in 24 hours.
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