This is SF18650 2200mAh 3.7V cylindrical cell ( LiCoO2) . Type: Cylindrical cell ( LiCoO2) Nominal Capacity: 2200mAh Nominal Voltage: 3.7V Configuration: one single cell Dimensions Diameter: 18.2mm Length: 65.3mm ( middle value) Weight: Approx.: 42.5 g Maximum Continuous Discharge: 1C Maximum Continuous Current: 2.2A Ideal for use in Laptops, Power tools, Mineral lamps, ect.