12v battery box that fits the inexpensive mightmax battery found on Amazon.  It has two openings for leads to come out of the box.  If you need more, either tweak the stl for more or simply drill out new ones.  There are also tabs that once you are setup, you can use zip ties to keep it closed if needed.  Mine will be used outside and it can get windy, so I will zip tie mine closed.

Thank you for looking and have a great day.