The OTR Group Size 31S Platinum AGM Heavy Duty Truck Battery ensures Expertise Built In™, being built for power from the inside out. The increased cell compression, solid cast plate construction, and stronger top-lead connectors are improved for longer battery life. This semi truck battery is designed for extended heavy duty use with the premium glass mat separator. Gain excellent starting power in applications that require increased electronics demands, extreme robustness, and high-cranking ability. Built tough and tested tougher, this Group Size 31 heavy duty battery is designed to extend life and improve performance. OTR knows what it takes to repair and maintain Class 6-8 trucks, so they deliver solutions, making your job easier and more efficient. OTR warranties are comparable to or better than OE and top brands. All heavy duty truck parts offer the same form, function, and fit as the OE replacement parts. FleetPride is your First Click in Heavy Duty®.