Nikon D800 User Manual (en)

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The Battery and Charger
Read and follow the warnings and cautions on pages xiii–xand 401–404 
of this manual. 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.
If the CHARGE lamp flickers (i.e., flashes 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 short the charger terminals; failure to observe this precaution 
could result in overheating and damage to the charger. 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 (
show a temporary decrease.
The battery may be hot immediately after use. Wait for the battery to 
cool before recharging.
The supplied power cable and AC wall adapter are for use with the 
MH-25 only. Use the charger with compatible batteries only. Unplug 
when not in use.
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.