A Gridfinity compatible storage for your tiniest LR44 batteries. This is 1x2x3U and each battery has a nice snug fit without being too tight. The slots have fine chamfers on them to improve your ability to insert the batteries without them getting caught on the edges.

The holder has space for 25 batteries, so you should have more than enough space to store all of your batteries. It is also stackable, so you can place any other bins on top, even when full. This does mean that it's a bit harder to grab batteries out of this container, but there is already a good deal of space around the batteries to make it possible.