This is another design I've come up with to enclose the battery stud connection within an enclosed box. It uses a m8 or ½ inch bolt  passed through the bottom and held in place with the printed hex. There`s screw holes on the inside to mount the box plus push in caps to cover the screws. The lid is a snug fit and is also secured in place with the cable grommets, there's three different sizes in the print profile.

Recommend printing in asa, I've added brim but if you print in pla or petg there not needed.