Power bank as NVG Battery Box
thingiverse
You'll be needing a power pack consisting of four 18650 batteries, fashioned after the design of an NVG battery box for your helmet. To assemble this rig, you'll need to secure it with solvent-based adhesive. The PCB can be sourced from a low-cost power bank purchased on AliExpress. Meanwhile, the spring contacts required can be salvaged from old electronics.
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