Nikon D700 - Manual (Page 427)

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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.