Attwood Large Battery Box Attwood Large Battery Box is a vented black battery box for larger applications 9-34 maximum battery height. Constructed of polypropylene for total acid resistance. Hold-down straps resist 350 lbs of force, nearly four times the USCG requirement. Attwood Battery Boxes are drop tested in temperatures ranging from -20F to 120F. Attwood Battery Boxes meet ABYC Standard E-10 and U.S. Coast Guard Specification Number 183.420 as an OEM-installed battery hold-down system. Moun