Battery Holder

This thing allows you to create a battery holder in pretty much any way you like. There are now too many types of batteries supported to make examples for all of them, but I've included a few random example STL files for common batteries in case you aren't comfortable with OpenSCAD.

**Supported Battery Types:**
- AA
- AAA (or N, or A23)
- C
- D
- 9V
- CR2
- Lithium-Ion Rechargeable Cells
* 5 digit codes except 75400
- Button Cells
* 3 digit codes starting with 4, 5, 6, 7, o