The batteries are designed for backup power systems in uninterruptible power supplies, used in telecommunication systems of industrial, office and other institutions. Specifications: Number of elements: 3 Voltage: 6 V Nominal capacity: 4.5 A / h at a 20-hour discharge to 1.75 V per element at 25 ° C Weight: 0.67 kg (Tolerance ± 5.0%) Internal resistance: 23 mOhm Terminal type: F1 Maximum discharge current: 45 A (5 seconds) Short-circuit current: 234 A Shelf life: 6-8 years Maximum charging current: 0.45 A Test capacity: C3 3.49 AHC5 3.94 AHC10 4.23 AHC20 4.54 AH Charging voltage in buffer mode: 6.85 V ~ 6.95V@25°C Temperature Compensation: -3mV/°C/cell Cycle Charge Voltage: 7.30V~7.40V@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 (73*50*108), mmDevice size (70*47*105), mmNET, kg: 0.72000GROSS, kg: 0.86400 Please note! Failure to comply with the voltage and charge-discharge currents may damage the battery and void the warranty.