Summary

I liked enif's flexing battery project a lot, but wanted to make some custom modifications and integrate it into a project of my own.
OpenSCAD is a great tool, but I find it difficult to use. I wanted a model file that I could integrate into a typical CAD software package.

I went through the trouble of installing FreeCAD and obtaining a nice STEP file for the base battery package. Hopefully someone else can use it as well.

Tested successfully.