Remixed Ambossa3D's smaller version of the gridfinity storage box to use as a battery storage box. I flattened the lid to allow room for the AA batteries as I didn't intend on stacking the boxes. I also only used the fully printed hinges as I didn't want to deal with hardware but did leave the other style hinge in the file if you'd prefer that type. See Ambossa3d's post for details on what hardware to use if you use that hinge. Once everything is printed, I just used a little super glue to lock the hinges in place. I printed everything in ASA as I keep this in the work truck but it should print fine in other materials if need be. Clone the inserts that best fit your needs or see Dalkain's inserts page linked below for other options.

Included are also some slightly modified versions of:

Dalkain's battery inserts

and 

KYZ Design's 3x1 bin