Operating Temperature Range - Discharge: -15°C to 50°C Operating Temperature Range - Charging: -10°C to 50°C Operating Temperature Range - Storage: -20°C to 50°C Buffer charging voltage (25°C): 13.5-13.8V DC Cyclic charge voltage (25°C): 14.4-14.7 VDC Maximum charging current: 1.65A Maximum discharge current: 55A Estimated service life (25°C): 5-8 years