Newcon Optik NVS 6 - Manual (Page 27)

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2.3.2 Low Battery indicator check.
At the base of the NVS 6 mount is a red light-emitting diode
(LED) that comes on or blinks at a steady rate when battery
voltage is low (see Fig.2-4). To make sure this indicator works,
perform the following check. With good batteries installed in
both compartments of the power pack, open one of the battery
compartment and pull the cartridge part way out, to make sure
you break the electrical contact.
NOTE
The low-battery indicator must be checked prior to attaching
goggles to the mount or in the flipped-up position
Turn the power switch ON to the side where the battery
compartment is open. The Low-battery indicator should come on
or blink.
WARNING
If eyeglasses are worn, the upper rims of the eyeglasses
can obscure the low-battery indicator.
Fig. 2-4. Low-Battery indicator.