A simple rack for storing DeWalt 20V Max batteries. These was specifically designed to fit the 2, 5, and 6 amp packs as is but would also fit some others by scaling the model as needed. I do not have any of there other batteries to measure so I'm not sure what batteries exactly will or will not fit.

EDIT: Apparently this size fits the slightly older batteries but will have to be scaled slightly for the new style of batteries.

The photo shows a thinner version. The files have been updated to be thicker and add mounting holes on the back.