Prepare your vehicle to be Ready for the Road Ahead , with the Deka Group Size 4D Heavy Duty Commercial Flooded Battery, a reliable battery that powers your components all year round. By utilizing a genuine calcium lead alloy for longer waterless operation and extended life, this replacement battery for semis is able to deliver consistent power in even the chilliest of temperatures. Built with rugged and heavy duty materials to efficiently maintain a charge, jump start other vehicles, and keep your vehicle running its best in all types of weather conditions. FleetPride is your First Click in Heavy Duty .