Nikon D3S - Manual (Page 449)

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Battery Life
The number of shots that can be taken with a fully-charged
EN-EL4a battery (2,500 mAh) varies with the condition of the
battery, temperature, and how the camera is used. Sample figures
are given below.
• CIPA standard: Approximately 4,200 shots. Measured at 23 °C/
73.4 °F (±2 °C/3.6 °F) with an AF-S NIKKOR 24–70mm f/2.8G ED
lens under the following test conditions: lens cycled from infinity
to minimum range and one photograph taken at default settings
once every 30 s. Live view not used.
• Nikon standard: Approximately 4,700 shots. Measured at 20 °C/
68 °F with an AF-S VR 70–200mm f/2.8G ED lens under the
following test conditions: vibration reduction off, image quality
set to JPEG normal, image size set to L (large), shutter speed
1/250 s, shutter-release button pressed halfway for three
seconds and focus cycled from infinity to minimum range three
times; six shots are then taken in succession and monitor turned
on for five seconds and then turned off; cycle repeated once
exposure meters have turned off.