Simple holder with compartments for AA and AAA batteries. It requires minimum amount of plastic to print. 
I don't like an idea to have different organizers for this two types of battery so I created this design to keep them all in one place. You can also print dividers to separate discharged batteries and to keep them in the same place. 

Versions

• Smaller (42x84x25mm)
• Smaller with Gridfinity base (2x1 slots)
• Bigger (42x168x25mm)
• Bigger with Gridfinity base (4x1 slots)

Gridfinity versions are identical to normal but have solid bottom with grid slots.

Printing

• 2 walls perimeters
• outer/inner wall printing order
• doesn't require infill
• 3 bottom shell layer