Product Details:Material: Li-ionType: 26650Nominal Voltage: 3.7V ( at 0.2C discharge current )Capacity:5500mAh ( Typical ) 5100mAh ( Minimum ) (From 4.2V to 2.8V at 0.2C discharge current )Charge method: CC / CV ( Constant Current / Constant Voltage )Charge voltage: 4.2 + / - 0.049VCharge current: 1000mA x 6hrs ( Standard ) 2000mA x 3hrs ( Rapid )Discharge current: 2500mA ( Normal Discharge Current ) 5000mA ( Maximum Continuous Discharge )Discharge cut-off voltage: 2.8V / cellCharge: 10 - 50 degree Discharge: -20 - 55 degreeNon-operating temperature: -40 - 60 degree