With Expertise Built In™, the OTR Group Size 31A Silver Heavy Duty Truck Battery is built for power from the inside out, highlighting state-of-the-art grids that are calcium/lead alloy punched. This technology supports maintenance-free performance, consistent power, enhanced durability, and added cold performance for increased starting capabilities in colder temperatures. Our Silver Group 31’s batteries are an excellent OEM replacement battery to keep you moving down the road. 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®.