Special PP plastic with steel casing outside and extra thick design battery plate, UN-ML range maximizes an outstanding performance to 20 years service life and deep cycle capacity, offering an ideal solution for large capacity valve regulated lead-acid batter requirements with a compact, quick and simple installation process. Features&Benefits Floating Life:>20 years(25?) Cycle life:>1200 cycles (80%DOD) Floating Voltage:2.25VPC(25?) Equalize Voltage:2.35VPC(25?) Flame Retardant:UL94-V0 Cell Capacity:100Ah~2000Ah Applications Telecommunications-Central Office Telecommunication-Outside Plant Photovoltaic Solar System UPS & Electric Utility Emergency Power System