Nikon D5 User Manual page 45

Charging is complete when the chamber lamp stops flashing
and the charge lamps turn off. About 2 hours and 35 minutes
are required to fully charge an exhausted battery; note that
the battery will not charge if its temperature is below 0 °C
(32 °F) or above 60 °C (140 °F).
5
Remove the battery when charging is complete.
Remove the battery and unplug the charger.
D
Calibration
See page 468 for more information on calibration.
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