The author remixed this model.
I wanted to have a 12 slot module for the charged batteries, and collect empties in the original 6 slot module.
The recent clone/remix by umendes uses a tighter hole diameter and different design, but the original unit already has a very good fit (at least with my printer). So I used Mesh Mixer to hack together two copies of the original 6 slot module to create the 12 slot module.
When slicing, make sure to check the walls with the AA lettering for irregularities in the printed lines due to surface artifacts. With PrusaSlicer the artifacts from the STL were gone (all lines straight), but maybe your slicer settings will keep them.
Note: The AA lettering is always on the left side. If I ever create a AAA 2 or 3 row variant, I'll try to keep it like that.