Nikon D300 User Manual page 444

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
• Using the optional WT-4 wireless transmitter
• Using the optional GP-1 GPS unit
• Using VR (vibration reduction) mode with VR lenses
To ensure that you get the most from rechargeable Nikon EN-EL3e
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.
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