Sony SPP-A941 - Manual (Page 17)

Basics
Basics
17 US
If the handset battery becomes weak during a call
You hear a beep every three seconds and the TALK/BATT LOW lamp
on the handset flashes.
The call will disconnect soon. Replace the handset on the base unit to
charge.
For optimum performance, charge the battery for a full 10 hours.
Note that during the first 10 - 15 minutes of charging, the phone will be
inactive, i.e., unable to make or receive a call.
After this initial 10 - 15 minutes, you may be able to use the phone, but
the battery duration will be very short; thus it is recommended that
you fully charge the battery before the next usage.
Redialing
1
Press (TALK/FLASH).
The TALK/BATT LOW lamp lights up.
2
Press (REDIAL/PAUSE) to redial the number last dialed.
Note
If the number last dialed exceeds 16 digits, only the first 16 digits are dialed.