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393Technical Notes
The following can reduce battery life:
Using the monitor
Keeping the shutter-release button pressed halfway
Repeated autofocus operations
Taking NEF (RAW) photographs
Slow shutter speeds
Using the built-in Wi-Fi function or using an optional GP-1 or
GP-1A GPS unit or WR-R10/WR-1 wireless remote controller
Using an Eye-Fi card
Using VR (vibration reduction) mode with VR lenses
To ensure that you get the most from rechargeable Nikon
EN-EL14a 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.