Newcon Optik NVS 6 - Manual (Page 14)

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1.6 ELECTRICAL FUNCTIONS
1.6.1 Power source
The system is powered by two 1.5V alkaline or lithium
replaceable batteries (see Fig.1-7), inserted in power pack.
1.6.2 Electrical function
Power from the batteries is supplied to the components through
the power pack's 3-positions (ON-OFF-ON) power switch as
follows. In either of ON-positions - power is supplied from the
appropriate battery compartment to power up the goggles.
When the voltage drops to approx. 2.1 Vdc, a low-battery
indicator at the base of the mount assembly blinks, indicating
approx. 30 minutes of operating time left on that battery
compartment.
In OFF-position - the system is not energized from either battery
compartment. With the switch in either of the ON-positions,
power from the battery compartment is applied through the
power cable, through the matching contacts in the mount to the
matching contacts inside the monocular onto the image
intensifier assembly (Fig.1-7).