18500 Battery Sled

This is a really rough mock up for a battery sled designed for 18500 series batteries.
Edit I removed the original files as there were many problems with it.
These new files fixed:

1. The square holes on the buttom removed. They were where I was planning on attaching the contacts but it was pointed out that if they were there, I'd have to remove an epoxied sled if they needed replacing.
2. Measurements are even. Previous model was not uniform in it's curves, this new model is uniformed.