Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5377526.

This is a remix of https://www.thingiverse.com/thing:2576381

I've added screw holes to accomodate drywall screws.

I would increase the size by 1% because the print is pretty tight. But, if your batteries are in a mobile unit, the tight may be wanted.