Lithium Titanate Batteries 40Ah: Nominal Voltage:2.3V Nominal Capacity:40AH Discharge cut-off Voltage:1.5V Charge cut-off Voltage:2.9V Charging current: 240A Cont.discharge:240A Peak discharge:800AH Internal Impedance:≤1mΩ Work Temperature: -50℃ - 65℃ Charge Method: CC/CV Life Cycle: 20000+ Size: (DIA)66mm*(H)160mm Weight:1.23kg