Special computer-aided design and heavy-duty manufacturing techniques mean more durability for line haul trucks, buses, farm tractors and off-road equipment. Premium deep pocket envelope separators, protect the plates on all four sides to dramatically reduce shorting and extend service life. Genuine calcium lead alloy provides longer waterless operation and extended battery life. Anchor-locked elements with tight-pack commercial plates resist the damaging effects of vibration, delivering more power-per-pound than other batteries. Available wet and many can be ordered dry. A special dry-charge process completely eliminates moisture for virtually unlimited shelf life. Most popular sizes feature tough polypropylene cases which resist breakage and extend service life. Many are also available with handles and special terminals for easy installation. One of the most complete line of enveloped calcium maintenance-free commercial batteries in the industry including such hard-to-find group sizes such as 3D.