Nikon d3s User Manual (en)

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.