Could not find a battery box to suit - lots of hinged lid versions and some push on lids but they were hard to remove the batteries - so got out the FreeCad and designed my own.  There are two small catches on each side to prevent accidental opening and small lips on both the body and lid to aid opening when wet. (Intended use is on a boat)  Also single file so they are not too bulky to be slipped into a pocket.

Easy print with no supports