With Expertise Built In™, the OTR Group Size 31S Platinum AGM Heavy Duty Truck Battery is built for power from the inside out. Gain improved battery life with the increased cell compression, solid cast plate construction, and stronger top-lead connectors. This semi truck battery is engineered for extended heavy duty use with the premium glass mat separator. Experience 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 understands 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®.