With Expertise Built In™, the OTR Group Size 31A Gold Anchor Bonded Heavy Duty Truck Battery is built for power from the inside out, boasting state-of-the-art-grids that are calcium/ lead alloy punched. This grants maintenance-free performance, consistent power, and increased durability. Furthermore, the anchor bonding “anchors” the plates to the bottom of the container, which advances protection against vibrations and bumps in 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®.