Absolyte batteries are built for dependable stationary power, but even a long-lasting battery eventually needs replacement. What Type of Battery Is an Absolyte Battery? Absolyte batteries are large valve-regulated lead-acid batteries, commonly called VRLA batteries. Although their enclosed design reduces routine maintenance, Absolyte batteries still contain lead, sulfuric acid electrolyte, plastic housings, copper connections, and other recyclable components. Manufacturer instructions warn that Absolyte batteries contain sulfuric acid and can release gases under certain conditions, making proper handling and ventilation important.