21700 Battery Holder

Warning
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Rechargeable Lithium Ion batteries are potentially hazardous and can present a serious FIRE HAZARD.

Do NOT attempt to assemble Li-Ion cells unless you are competent and know what you are doing.

Use this design at your own risk
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A 2S holder for 21700 Li-Ion cells. Originally intended for HDZero Goggles.
This does fit together OK, but should be considered a work in progress.

There is space for a battery checker (the 2S variant)
https://www.aliexpress.com/item/33048284052.html?spm=a2g0o.order_list.order_list_main.25.21ef1802DoR3Ua


There is also a slot for a BMS
https://www.amazon.co.uk/dp/B09N6SLJQ7?psc=1&ref=ppx_yo2ov_dt_b_product_details


Fastened with eight 2mm x 8mm self tappers with 1.5mm hex head, like these
https://www.amazon.co.uk/Sourcingmap%C2%AE-Threaded-Carbon-Tapping-Screws/dp/B012THI93G


Added a second version of the case body, with the holes closed up in case a voltage checked is not needed at this time.