Vented battery box. This battery box is built according to strict R.V.I.A. Specifications. It is a tongue and groove sealed unit. 9-3/4″ x 7-1/8″ x 12-3/4″. Inside dimensions are 9-1/2 high x 6-7/8 wide by 9-1/2 high. There is a vent on the top of the box which will allow venting to outside of the trailer.