I have a bunch of Panasonic Eneloop AAA batteries and I've learned that they're slightly wider than a standard AA battery.  As a result, I figured I'd go ahead and design my own #gridfinity container. I was able to modify Jamie's OpenSCAD Gridfinity Model and clumsily tweak it to hold my AA batteries tightly enough .

I tried it with a few other standard AA batteries that I have around the house and it works well for them,  but depending on their diameter, and depending on the differences between our 3D-printers' calibrations they may fit a bit  tighter or looser for you.

I designed this intentionally to be on the tight side. I don't want my batteries coming loose when I pull the bin out of the drawer.

This is a parameterized design which can be customized to meet your own needs:

• Add additional sets (3) of AAA batteries.
• Adjust the size of the battery holes.
• Add or Remove holes for magnets.

All customizations

1. Download and install OpenSCAD
2. Download and unzip All Model Files
3. Run OpenSCAD and open the gridfinity_battery_aaa.scad file.

Adjusting the hole size to fit your batteries: 

1. Measure your batteries with a caliper and update the battery_diameter variable (default is 10.65mm)

Adding magnet holes

1. Change the magnet_holes value to true. (default is false)

Export the STL

1. Save the changes to the .SCAD file
2. Render in OpenSCAD  (Design > Render)
3. Export updated the STL (Design > Export)