Keeping you Ready for the Road Ahead™, the ODYSSEY Extreme Group Size 31 Heavy Duty AGM Truck Battery is built to last. This heavy duty battery boasts double overall power and three times the service life of conventional batteries, providing optimal charge performance. Comprised of 99% pure lead, the flat plates of this heavy duty AGM battery are thinner, allowing for more of them to be used inside the battery. ODYSSEY Extreme batteries provide up to 2,150 amps of engine cranking pulses for five seconds, even in extremely low temperatures. Experience 70% longer cycle life than conventional deep cycle batteries, providing high, stable voltage for longer periods of time. This heavy duty semi 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®.