The HR series VRLA battery is designed for heavy loads, has high power, and a long service life in float (buffer) mode. The HR series battery has 30% more power than standard series batteries and is used in backup power systems with UPS. Specifications:Number of cells: 6Voltage: 12VNominal capacity: 9Ah at 20-hour discharge to 1.75V per cell at 25°CWeight: 2.55kg (Tolerance ±5.0%)Internal resistance: 20mΩTerminal type: F2Maximum discharge current: 90A (5 seconds)Short-circuit current 450AScshelf life: 10 yearsMaximum charging current: 0.9AReference capacity:C3 6.98AHC5 7.89AHC10 8.46AHC20 9.06AHFloat charging voltage: 13.7V~13.9V at 25°CTemperature compensation: -3mV/°C/cellCyclic charging voltage: 14.6V~14.8V@25°C Temperature Compensation: -4mV/°C/cell Operating Temperature Range: Discharge: -20°C~60°C Charge: 0°C~50°C Storage: -20°C~60°C Normal Operating Temperature Range: 25±5°C Case Material: A.B.S. UL94-HB, UL94-V0C Self-Discharge: RITAR Rechargeable Voltage Regulated Lead Acid (VRLA) batteries can be stored for up to 6 months at 25°C, and then recharging is recommended. The monthly self-discharge rate is less than 3% at 25°C. Please charge the batteries before use. Please note! Failure to comply with the charge-discharge voltage and currents may damage the battery and void the warranty.