Summary
This is a simple battery case holder.
I made the holder part first only to realize it is not stackable, so I decided to make a another case to serve as a lid and also make it stackable.
I am an extruded plastic fan, so the "lid" was made from 3mm extruded plastic and the actual box with 3mm white MDF,
I have listed them as page 1 and 2 in the files, named 1) Case and 2) Lid.