The RITAR OPzS2-800 battery is a lead-acid battery with a liquid electrolyte that utilizes tubular plate technology for high reliability and performance. The battery is designed and manufactured according to DIN40736/IEC60896 standards for the positive plates and features a proprietary formula for cast active material. OPzS series batteries provide 400% greater cycle life than standard series batteries. This battery is suitable for energy storage in solar and wind energy systems, as well as for traction applications. The OPzS series is the best choice for energy storage systems in high-altitude areas. Specifications:• Cells per unit: 1• Voltage per unit: 2V• Nominal capacity: 800Ah at a 10-hour discharge to 1.80V per cell at 25°C• Weight: Without electrolyte 50.5 kg (tolerance ±5%), with electrolyte 64.3 kg (tolerance ±5%)• Internal resistance: 0.35 mΩ (at full charge at 25°C)• Terminals: Default F10(M8)• Maximum discharge current: 3200A (5 sec)• Estimated life: 20 years• Maximum charge current: 120.0 A• Reference capacity: • C5: 611.4Ah • C10: 800.0Ah • C20: 968.0Ah• Float charge voltage: 2.23V-2.25V@25°C• Float Temperature Compensation: -3mV/°C/cell• Cycle Voltage: 2.40V-2.45V@25°C• Cycle Temperature Compensation: -4mV/°C/cell• Operating Temperature Range: • Discharge: -15°C to 50°C • Charge: 0°C to 40°C • Storage: -15°C to 50°C• Normal Operating Temperature Range: 25°C ±5°C• Self-Discharge: OPzS series batteries are lead-acid batteries with flooded electrolyte. They can be stored for up to 2 years before refilling with acid. The monthly self-discharge rate is less than 3.5% at 20°C. Batteries need to be charged before use.• Housing Material: S.A.N. UL94-HB, UL94-V0 optional.• Dimensions:• Length: 191 ±2 mm (7.52 in)• Width: 210 ±2 mm (8.27 in)• Height: 646 ±2 mm (25.4 in)• Overall Height: 703 ±2 mm (27.7 in)• Torque Value: 10-12 N m