18500 LiFePO4 battery holder
thingiverse
I went old school on this design because it works so well. A simple and effective approach to housing a 18500 LiFePO4 battery that powers solar lights and other outdoor devices. Additional components required: 1x 3mm x 6mm Socket Head Cap Screw (SHCS) 1x 3mm nut 1x 4mm x 8mm SHCS 1x 4mm nut 1x 4mm spring with an inner diameter of 4mm, cut to a short length - enough for two holders.
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