A Gridfinity compatible storage for your largest D batteries. This is 2x3x5U and has more than enough room to grab each battery.

The slots have fine chamfers on them to improve your ability to insert the batteries without them getting caught on the edges, and the square holes make it so that even the thickest batteries are easy to insert and remove without air sucking them in or the plastic damaging the outer coating of your batteries.

The holder has space for 6 batteries, so you should have more than enough space to store all of your batteries.