This bin from my collection of stackable Gridfinity battery holders. It holds 6 9V batteries. I also have versions for other batteries here.

These were modelled after the factory blister packs with finger access and other features added to improve access. The inside-bottom of each bin is labelled for faster identification of empty bins. The print profile contains plates with single color and two color versions. 

Note that with this bin, the batteries have more side-to-side play than with my other battery bins. This is intentional to ensure the batteries are easy to remove, even when the bin is full.

The base is intended for the standard Gridfinity grid and can be be placed at any position or half-way position on the grid. When placed next to a second bin, the pair take up a 3x3 space. Where there half-width strip on one edge of the grid, such as from my Gridfinity interlocking baseplate generator, they work very well for utilizing that space.

I place my empty bins under a bin of a different color so I know when I am running low.