Nikon D4s User Manual page 490

The following can reduce battery life:
• Using the monitor
• Keeping the shutter-release button pressed halfway
• Repeated autofocus operations
• Taking NEF (RAW) or TIFF (RGB) photographs
• Slow shutter speeds
• Connecting to Ethernet or wireless networks
• Using a GP-1 or GP-1A GPS unit
• Using a WR-R10/WR-1 wireless remote controller or ML-3
modulite remote control set
• Using VR (vibration reduction) mode with VR lenses
To ensure that you get the most from rechargeable Nikon EN-EL18a
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.
• Check the condition of the battery regularly using the Battery
info option in the setup menu (0 365). If j is displayed for
Calibration, calibrate the battery using the MH-26a battery
charger (if the battery has not been used for more than six
months, recharge the battery when calibration is complete).
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