Nikon D750 DSLR Camera (Body Only) - Manual (Page 486)

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• The internal temperature of the battery may rise while the battery is in
use. Attempting to charge the battery while the internal temperature
is elevated will impair battery performance, and the battery may not
charge or charge only partially. Wait for the battery to cool before
charging.
• Charge the battery indoors at ambient temperatures of 5 °C–35 °C
(41 °F–95 °F). Do not use the battery at ambient temperatures below
0 °C (32 °F) or above 40 °C (104 °F); failure to observe this precaution
could damage the battery or impair its performance. Capacity may be
reduced and charging times increase at battery temperatures from 0 °C
(32 °F) to 15 °C (59 °F) and from 45 °C (113 °F) to 60 °C (140 °F). The
battery will not charge if its temperature is below 0 °C (32 °F) or above
60 °C (140 °F).
• If the CHARGE lamp flashes quickly (about eight times a second) during
charging, confirm that the temperature is in the correct range and then
unplug the charger and remove and reinsert the battery. If the problem
persists, cease use immediately and take battery and charger to your
retailer or a Nikon-authorized service representative.
• Do not move the charger or touch the battery during charging. Failure
to observe this precaution could in very rare instances result in the
charger showing that charging is complete when the battery is only
partially charged. Remove and reinsert the battery to begin charging
again. Battery capacity may temporarily drop if the battery is charged
at low temperatures or used at a temperature below the temperature
at which it was charged. If the battery is charged at a temperature
below 5 °C (41 °F), the battery life indicator in the
Battery info ( 0 383)
display may show a temporary decrease.
• Continuing to charge the battery after it is fully charged can impair
battery performance.
• A marked drop in the time a fully charged battery retains its charge
when used at room temperature indicates that it requires replacement.
Purchase a new EN-EL15 battery.
• The supplied power cable and AC wall adapter are for use with the
MH-25a only. Use the charger with compatible batteries only. Unplug
when not in use.