Ensure your vehicle is Ready for the Road Ahead with a reliable battery that powers your components all year round, with the Deka Group Size 31 Heavy Duty Commercial Flooded Battery. To resist the damaging effects of vibration, this replacement battery for semis is crafted with deep pocket envelope separators and anchor-lock elements that hold the device in place. Fashioned with durable and heavy duty materials to effectively hold a charge, jump start other batteries, and keep your vehicle running its best in any type of weather condition. FleetPride is your First Click in Heavy Duty .