Battery Boxes

thingiverse

I stock up on batteries in large quantities and got fed up with them scattering all over a drawer, so I came up with several custom boxes to keep the problem under control. Each box has identical exterior dimensions, with only a slight variation allowed. The capacities inside are randomly distributed but evenly split between the bulk packs I buy, giving my plan some sense of purpose. So far, I've created cases for 9V, AA, and AAA batteries. What ideas do you have to make these boxes even better?