simple case for a single 21700 cell
double o-ring for water proofing the usb connectors and the cell
simple screw in mechanism
What you need:
powerbank charger module: https://www.amazon.de/dp/B0BGPGM4DH?psc=1&ref=ppx_yo2ov_dt_b_product_details
battery clips 2x
21700 cell
2x O-Ring ID 28mm 3.5mm thick
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