Nikon D300s - Manual (Page 393)

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Batteries : Dirt on the battery terminals can prevent the camera from
functioning and should be removed with a soft, dry cloth before use.
Batteries may leak or explode if improperly handled. Observe the
following precautions when handling batteries:
Turn the product off before replacing the battery.
The battery may become hot when used for extended periods. Observe
due caution when handling the battery.
Use only batteries approved for use in this equipment.
Do not expose the battery to flame or excessive heat.
After removing the battery from the camera, be sure to replace the
terminal cover.
Charge the battery before use. When taking photographs on important
occasions, ready a spare EN-EL3e battery and keep it fully charged.
Depending on your location, it may be difficult to purchase replacement
batteries on short notice.
On cold days, the capacity of batteries tends to decrease. Be sure the
battery is fully charged before taking photographs outside in cold
weather. Keep a spare battery in a warm place and exchange the two as
necessary. Once warmed, a cold battery may recover some of its charge.
Continuing to charge the battery after it is fully charged can impair battery
performance.
Used batteries are a valuable resource. Please recycle used batteries in
accord with local regulations.