Nikon J3 - Manual (Page 228)

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Battery Life
The number of shots or movie footage that can be recorded with
fully-charged batteries varies with the condition of the battery,
temperature, the interval between shots, and the length of time
menus are displayed. Sample figures for EN-EL20 (1020 mAh)
batteries are given below.
• Still images: Approximately 220 shots
• Movies: Approximately 45 minutes of HD footage at 1080/60i
Measured according to CIPA standards at 23 ±3 °C (73.4 ±5.4 °F)
with the camera at default settings, a fully-charged battery, a
1 NIKKOR VR 10–30mm f/3.5–5.6 lens, and a 16 GB Toshiba
SD-E016GUX UHS-I SDHC card. Value for still images obtained
under the following test conditions: photographs taken at
intervals of 30 s with the built-in flash fired with every other
shot and the camera turned off and then on after every ten
shots. Value for movies obtained under the following test con-
ditions: a series of 20 minute movies with a file size of up to
4 GB were recorded; recording was only interrupted when tem-
perature warning was displayed.
The following can reduce battery life:
• Keeping the shutter-release button pressed halfway
• Repeated autofocus operations
• Taking NEF (RAW) photographs
• Slow shutter speeds
• Using a wireless mobile adapter or Eye-Fi cards
• Using vibration reduction mode with VR lenses
• Using zoom with power zoom 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.