18650 3S4P rack
thingiverse
Made these for my portable power pack. Works great with this BMS. https://www.ebay.com/itm/3S-25A-12V-BMS-18650-Li-ion-Lithium-Battery-Lipo-Charging-Protection-Board-TE910/312123044794?hash=item48abfbb3ba:g:TTkAAOSwkRha6P~l
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