Single 18650 Battery Holder

thingiverse

Here's a basic 18650 battery holder. It uses commonly available contacts found on online marketplaces like E-Bay, Amazon, and similar sites. Update Jun-23-2019: I've uploaded new STL files recently. The main change is that both battery contacts simply sit in a recess instead of the negative one sliding into a slot. A small dab of glue behind each contact holds them in place nicely. The other change is that I've built this design with six different battery lengths, ranging from 65mm to 70mm, to hopefully accommodate protected cells that are slightly longer.