These 21700's are the future of vaping. 18650's are a thing of a past. Better amperage and milliamp capacity, vape for longer and have a better experience.
Nominal Capacity: 4000mAh
Nominal Voltage: 3.6V
Maximum Voltage: 4.2V
Discharge Current: 30A Maximum Continuous
Style: Flat Top
Approximate Dimensions: 21.1mm x 70.4mm