Intended for use with the Vive Wireless Adapter. Based upon stu3d's TPcast battery holder:
https://www.thingiverse.com/thing:2674472
The horizontal
...Plus slots along the top can be used to secure the battery into the holder with velcro. I've used it without the velcro strap and the battery stays in pretty well, but at very steep angles using velcro will keep the battery firmly in place.
A velcro strap on the left and right sides are used to secure the holder to the deluxe audio strap.
