Nikon D4 (Body Only) 사용자 설명서

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Read and follow the warnings and cautions on pages xiii–xv and 408–411 

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.

Do not short the charger terminals; failure to observe this precaution 
could result in overheating and damage to the charger. Charge indoors 
at ambient temperatures of 5–35°C/41–95 °F. 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 (0 351) display may show a temporary 
decrease.

The battery may be hot immediately after use. Wait for the battery to 
cool before recharging.

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-EL18 battery.