Description Keep Heavy- Duty Equipment Running at Top Performance Demanding commercial equipment requires nothing less than the most powerful, reliable batteries.Key features of the DuraStart Commercial Line: Genuine calcium lead alloy provides longer waterless operation and extended battery life. Anchor locked elements with full-frame grids and tight packed commercial plates resist the damaging effects of vibration, delivering more power-per-pound than other batteries. Most of our commercial batteries contain "deep pocket" envelope separators, which protect the plates on all four sides to dramatically reduce shorting and extend service life. Special computer-aided design and manufacturing means more durability for heavy-duty line-haul trucks, buses, farm tractors and off-road equipment.