Pentax XG-1 Operating Manual page 24

Status Indicator Charging indicator:
Flashing red: Charging
The indicator will go out once charging
is finished, and the camera will be
powered off automatically.
To have maximum battery life, charge
the battery for at least 4 hours at the
first time.
The time required to fully charge
the battery is about 360 minutes
(max.). (The charging time may vary
depending on the ambient temperature
and charging conditions.) The
appropriate ambient temperature for
charging the battery is 0°C to 40°C
(32°F to 104°F).
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