Newcon Optik NVS 6 - Manual (Page 26)

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Batteries installation/replacement procedure shall be performed
as follows:
A. Push the a. battery pack covers up (open).
B. Remove the cartridge containing the two 1.5V AA batteries.
C. Check to make sure the interior of each battery compartment
is clean.
D. The required polarity for the battery is illustrated on the
inside of the cartridge module. Insert the replacement battery
into each battery cartridge module (Fig.2-3).
E. Insert the battery cartridge into the battery pack and close
the battery pack covers.
NOTE
Make sure to use fresh (no time) batteries before beginning
a mission. Some batteries that have been used, and still
have many hours of life remaining, can be used depending
on unit procedures.
Fig. 2-3. Battery cartridge