4 cell AA battery pack

4 cell AA battery case with built in spring structure.

This is designed for building 4-cell AA sized battery packs without soldering batteries together while still remain as slim as possible in order to fit battery chamber in devices designed for factory produced battery packs.

Each end has a partially connected ring structure that function as a spring to ensure firm contact with the battery. And in the center there are 4 5mm wide slots for you to secure wirings for the battery connection.

All you need in addition to the printed objects are a couple rubber bands that holds the assembly together, and some wiring for connecting batteries. 5mm wide solder tabs are preferred as connection material but you can use anything from copper wire to even 5mm wide aluminium bands cut from soda cans.

If you choose to use soda cans, be sure to remove coating on both sides to allow conductivity. You can do that by either burning it lightly or some sanding.