Battery Backup Mode - VTech SN5127 Quick Start Manual

Battery backup mode

When there is a power failure, all handsets display Put HS on base to power
base and Out of range OR No pwr at base alternately. Put a charged handset
in the telephone base to back up the telephone base power for some basic
phone operations for a short period of time. During this period, you cannot use
the answering system.
When a handset is put in the telephone base, it displays Powering base... Don't
pick up. At this time, use other handsets for some basic phone operations.
You may use the handset which is put in the telephone base for making or
answering calls via the handset speakerphone, but do not pick up the handset
while using it.
5