Sony SPP-S9101 Operating Instructions Manual page 11

Handset spare battery usage
As only one battery pack is supplied with this unit, it is necessary to
purchase an additional battery pack (optional) for use as a handset
spare battery pack.
1
2
BP-T31
3
SPARE
BATTERY
lamp
Open the battery compartment
lid of the base unit.
Insert the battery pack
(optional) into the battery
compartment.
Close the battery compartment
lid.
The SPARE BATTERY lamp
lights up. Charge the battery
pack for more than 24 hours so
that the battery is fully charged.
The SPARE BATTERY lamp
remains lit even after charging
is completed.
US
11
Getting Started