Nikon D4S - Manual (Page 437)

415
n
4
Latch the power
connector.
Rotate the latch to the closed
position (q) and fold it down
as shown (w). To prevent the
power connector being
dislodged during operation, be sure that it is securely latched.
The battery level is not displayed in the top control panel while
the camera is powered by the AC adapter and power
connector.