3s 18650 tripack endcap with integrated loop for zipties or velcro straps

thingiverse

i had lots of salvaged 18650s left over and needed some 3s battery packs for my r/c planes, so i designed this triangular endcap to secure 3 18650 in series in a compact manner. it has an integrated loop, so you can fix it to whatever you need with velcro or zipties. my panasonic 18650s fit in just right, other brands might be a tad fatter so you should scale it up 1% just in case. i recommend setting the caps in place with a flexible glue like sikaflex (or regular silicone) to protect your wires, balance leads, and your cells from shorting out due to water etc.