Summary： Valve Regulated Tubular Plate GEL Batteries for Stationary Applications AOKLY's OPzV batteries are characterized by maintenance-free, long service life, excellent reliable performance even in harsh conditions (high operating temperature or unstable power network) and durability under cyclic use, thus providing a premium efficient and cost effective energy solution. Optimum design, according to DIN international standards, exclusive use of high quality raw materials, robust construction and state of the art manufacturing processes make this OPzVrange an ideal solution for high demanding stationary applications.