Nikon J1 - Manual (Page 210)

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Battery Life
The number of shots that can be taken with fully-charged batter-
ies varies with the condition of the battery, temperature, the
interval between shots, and the length of time menus are dis-
played. Sample figures for EN-EL20 (1020 mAh) batteries are
given below.
• Still images: Approximately 230
• Movies: Approximately 70 minutes of HD footage at 1080/60i
Values for still images measured at 25 °C/77 °F with a fully-
charged EN-EL20 battery, a 1 NIKKOR VR 10–30mm f/3.5–5.6
lens, and a 16 GB Toshiba R95 W80MB/s UHS-I SDHC card
according to the CIPA standard under the following test condi-
tions: NORMAL-quality photographs taken at intervals of 30 s
with the flash fired with every other shot and the camera
turned off and then on after every ten shots.
The following can reduce battery life:
• Keeping the shutter-release button pressed halfway
• Repeated autofocus operations
• Taking NEF (RAW) photographs
• Slow shutter speeds
• Using vibration reduction mode with VR lenses
To ensure that you get the most from rechargeable Nikon
EN-EL20 batteries:
• Keep the battery contacts clean. Soiled contacts can reduce
battery performance.
• Use batteries immediately after charging. Batteries will lose
their charge if left unused.