Nikon Z8 User Manual page 959

Checking the Level of the Batteries in the MB-N12
When the MB-N12 is connected, the level of the battery currently
providing power to the camera is shown in the shooting display
and control panel while the camera is on (
The chamber containing the battery currently in use is indicated
by an icon next to the battery level in the shooting display.
Additional information, including the battery age and precise
battery level, can be viewed using the [Battery info] item in the
setup menu.
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Optional MB-N12 Power Battery Packs