Nikon D4 - Manual (Page 464)

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MH-26 battery charger
Rated input AC 100 to 240 V, 50/60 Hz
Charging output DC 12.6 V/1.2 A
Applicable batteries Nikon EN-EL18 rechargeable Li-ion batteries
Charging time per
battery Approx. 2 hours and 20 minutes at ambient
temperature of 25 °C (77 °F) when no charge remains
Operating temperature 0–40 °C (+32–104 °F)
Dimensions (W × H × D) Approx. 160 Ч 85 Ч 50.5 mm (6.3 Ч 3.3 Ч 2 in.)
Length of power cable Approx. 1.8 m/6 ft (U.S.A. and Canada) or 1.5 m/4.9 ft
(other countries)
Weight Approx. 265 g (9.3 oz), excluding power cable
EN-EL18 rechargeable Li-ion battery
Type Rechargeable lithium-ion battery
Rated capacity 10.8 V/2,000 mAh
Operating temperature 0–40 °C (+32–104 °F)
Dimensions (W × H × D) Approx. 56.5 Ч 27 Ч 82.5 mm (2.2 Ч 1.1 Ч 3.2 in.)
Weight Approx. 160 g (5.6 oz), excluding terminal cover