Charging the handset batteries
You must charge the handset batteries for 15 continuous hours the first time you use
them. NOTE: When the icon appears empty
shows on the LCD screen, or if you hear a warning beep during a call, please:
End the call as soon as possible.
Charge the handset by putting it back on the base cradle with the keypad
facing outwards. The green CHARGE LED on the base unit lights up
steadily to indicate that the handset is charging.
It is normal for the handset and base to get warm when the handset is
charging in the base.
Caution: Use only the Sanyo AC adaptor that is supplied with this phone. Using
another AC adaptor may damage the phone.
and "CHARGE BATTERY"