The HM408 4D Commercial Battery Box is a battery storage solution for sizes group 4D batteries, including 12V Marine, RV, Boat, and Trailer Batteries, as well as, Commercial Equipment. It features a four corner fastening system and captive lid for easy installations, large cable entry holes for heavy gauge wires, full flow ventilation for releasing battery gasses, and a large battery acid reservoir. Its rugged, rotationally molded design provides ultimate protection in low-temperature environments and protects against UV, oil, gas and other contaminants. Perfect installation in a boat, camper, motorhome, trailer, or caravan, as well as, commercial and generator equipment. Other commonly used search terms: battery box, battery box 12v, battery box marine, marine battery box, battery box RV, RV battery box, battery box boat, boat battery box, battery box vent, battery box with vent, battery box for boat, battery box for camper, battery box 4d, battery box group 4d, battery boxes, battery boxes marine