The ODYSSEY Performance Group Size 31 Heavy Duty Truck Battery is built to last, ensuring you stay Ready for the Road Ahead™. Gain consistent provision of power to an expansive amount of on-board accessories, while delivering a smooth start within the harshest of environments. Consisting of 99% pure lead, the flat plate design produces thinner plates, allowing for more of them to be used inside the battery. Thus, you get even more power when you need it. This heavy duty truck battery also features compressed AGM plate separators, providing improved vibration resistance and thus, longer battery life. FleetPride is your First Click in Heavy Duty®.