The Vmax 28ah AGM high-performance battery is a robust, heavy-duty AGM battery featuring special plates and premium plate separators, which provide outstanding performance and unparalleled deep-cycle capabilities. It boasts an AGM electrolyte suspension system and is constructed with custom-built, military-grade alloys. This battery offers rapid charge delivery capabilities and an extremely low self-discharge rate. It is safe for use in confined spaces as it does not spill, emit toxic fumes, or leak. It is designed to withstand extreme vibrations and has a sealed, non-spillable, and non-hazardous construction. The deep cycle capabilities of Vmax batteries are enhanced by their 99% gas recombination abilities. They require maintenance-free operation except for periodic surface cleaning and post-tightening.