Nikon D3X - Manual (Page 424)

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Replacing the Clock Battery
The camera clock is powered by a CR1616 lithium battery with a
life of about four years. If the B icon is displayed in the top
control panel while the exposure meters are on, the battery is
running low and needs to be replaced. When the battery is
exhausted, the B icon will blink while the exposure meters are
on. Photographs can still be taken but will not be stamped with
the correct time and date, and interval timer photography will not
function correctly. Replace the battery as described below.
1
Remove the main battery.
The clock battery chamber is located on the roof of the main
battery chamber. Turn the camera off and remove the
EN-EL4a battery.
2
Open the clock battery chamber.
Slide the clock battery chamber cover
toward the front of the main battery
chamber.
3
Remove the clock battery.
4
Insert the replacement battery.
Insert a new CR1616 lithium battery so
that the positive side (the side marked
with “+” and the battery name) is visible.