EOTech CNVD-T3 Clip-On Night Vision Device - Thermal 3 - Manual (Page 61)

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3.3.5 Replacing Battery Cap Lanyard . No tools are required
to perform this procedure.
a. Unscrew the battery cap until it comes free of the
battery compartment threads. Remove the battery
compartment o-ring as described in paragraph
3.3.4.b.
b. Pull the battery cap lanyard over the battery
compartment threads.
c. Grasp the middle of the battery cap lanyard with
fingers of one hand. Use fingers of the other hand
to separate the battery cap from the lanyard.
d. Stretch smaller eye of the replacement lanyard over
the post on the battery cap.
e. Pull large end of replacement lanyard over battery
cap threads. Work the lanyard down until it is
seated neatly in the groove closest to the CNVD-T3
housing.
f. Replace the battery compartment o-ring. Replace
and tighten battery cap.