Sony SPP-IM977 Operating Instructions - Page 26
If the battery becomes weak during a call, LINE°1
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Making calls (continued) If the battery becomes weak during a call The handset will beep every three seconds five times and E and "BATTERY LOW" appears on the display. Finish your call and charge the battery pack. For optimum performance, charge the battery for a full 12 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. If you have a spare battery You can replace the battery pack without disconnecting the call during a conversation. To replace the battery pack, perform the following procedure. 1 Press (HOLD) on the handset. The call is on hold and "HOLD" appears on the display. 2 Replace the battery pack. 3 Press (LINE 1) or (LINE 2) to resume the conversation. 26US Basics