Nikon 25442 D3X User's Manual - Page 424

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. n 398