The NP Series is a new generation of valve-regulated lead acid battery. It uses the latest in oxygen recombination technology to ensure you get the most out of your battery. The NP Series is designed for a range of specialty power applications. Special Features - can be stored for an extended period of up to a year. - sealed construction – no electrolyte leakage. - low maintenance. - pressure venting system, releasing excess gas. - great recovery from deep discharge. - electrolyte suspension system. - gas recombination. - multipurpose – float or cyclic use. - usable in any orientation (except continuous inverted). - superior energy density. - lead calcium grids for extended life. - application specific designs.