Simple 4S1P 21700 holder + 21700 cell holder

A simple battery holder for 21700 cells, format 4S1P, 1S4P, 2S2P... The contact is made using nickel tape wrapped around the contact pad. You can weld or solder the connectors. The bottom of the holder has grooves for the wires. I've also attached a file for one 21700 cell. You can splice as many as you need together in a CAD program that works with .stl files.