Nikon J1 - Manual (Page 83)

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MH-27 battery charger
Rated input AC 100–240 V, 50–60 Hz, 0.2 A
Rated output DC 8.4 V/0.6 A
Supported batteries Nikon EN-EL20 rechargeable Li-ion batteries
Charging time Approx. 2 hours at an ambient temperature of
25 °C/77 °F when no charge remains
Operating temperature 0–40 °C/+32–104 °F
Dimensions (W × H × D) Approx. 67.0 Ч 28.0 Ч 94.0 mm/2.6 Ч 1.1 Ч 3.7 in.,
excluding plug adapter
Weight Approx. 83 g/2.9 oz, excluding plug adapter
EN-EL20 rechargeable Li-ion battery
Type Rechargeable lithium-ion battery
Rated capacity 7.2 V, 1,020 mAh
Operating temperature 0–40 °C/+32–104 °F
Dimensions (W × H × D) Approx. 30.7 Ч 50.0 Ч 14.0 mm/1.2 Ч 2.0 Ч 0.6 in.
Weight Approx. 41 g/1.4 oz, excluding terminal cover