New larger capacity! Vented black battery box for Series 27 batteries. (10-1/2″ maximum height).Battery boxes meet ABYC Standard E-10 and U.S. Coast Guard Specification Number 183.420 as an OEM-installed battery hold-down system. Polypropylene construction for total acid resistance. Hold-down straps resist 350 pounds of force, nearly four times the USCG requirement. Battery Boxes are drop tested in temperatures ranging from -20F to +120F. Mounting hardware is included.New Features4 cable openings, enlarged to .55″ diameterLarger handles with rolled edgesInstructions molded inside cover