The Mighty Max Battery Box is designed for group U1 batteries. Designed to effectively collect battery acid, allows adequate ventilation, secures and locks the lid to the base, and prevents accidental contact of underground battery terminals. Designed for rugged environments; impact resistant down to -20 degrees Fahrenheit, withstands acid, gas, oil and other contaminants, and immune to UV exposure. Heavy-duty grade battery box for automotive, marine, lawn and garden and more; designed for a single group U1 battery. Compact design; features reinforced handles to prevent cracking during relocation and ventilation holes for releasing battery gases. Keeps your battery safe; limits water entry, effectively collects battery acid, allows adequate ventilation, and protects against accidental contact of battery terminals. Certified and tested; meets United States Coast Guard USCG Code of Federal Regulations 183.420 and American Boat and Yacht Council ABYC E-10.7 specifications.