Model: NCR18650B Nominal voltage: 3.7V Nominal capacity: 3400mAh 0.2C Discharge Charge voltage: 4.2V Standard charge: 0.2C constant current charge to 4.2v, then constant voltage 4.2v charge till charge current decline to ≤ 0.02C Rapid Charge: CCCV, 4A, 4.20±0.05V, 100mA cut-off Charging time standard charging: 5.0 hours Rapid charge: 3.0 hours Life cycle: More than 300 times Discharge cut-off voltage: 2.7V Operating temperature charge: 0℃~45℃; discharge: -20℃~60℃ Cell dimension height: 64.85±0.15mm; diameter: 18.33±0.07mm