The batteries are designed for backup power supply systems in uninterruptible power supplies, used in telecommunication systems of industrial, office and other institutions. Specifications: Number of elements: 6 Voltage: 12 V Nominal capacity: 5.5 A / h at a 20-hour discharge to 1.75 V per element at 25 ° C Weight: 1.39 kg (Tolerance ± 5.0%) Internal resistance: 35 mOhm Terminal type: F2 Maximum discharge current: 55 A (5 seconds) Short-circuit current 275 A Shelf life: 6-8 years Maximum charging current: 0.55 A Test capacity: C3 4.27 AHC5 4.82 AHC10 5.17 AHC20 5.54 AH Charging voltage in buffer mode: 13.7 V ~ 13.9V@25°C Temperature Compensation: -3mV/°C/cell Cycle Charge 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 Freeze Discharge: RITAR Rechargeable Battery 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. Packaging size (93*73*110), mmDevice size (90*70*107), mmNET, kg: 1.70000GROSS, kg: 2.04000Please note! Failure to comply with the voltage and charge-discharge currents may damage the battery and void the warranty.