Genunine Grade A lithium battery from Sony. VTC4 2100mAh High Discharge Flat Top and light weight and high performance with 30A continuous discharge.

Nominal Capacity: 2100 mAh
Nominal Voltage: 3.6V
Discharge End Voltage: 2.5V
Standard Charging Current: 1.25A
Charging Voltage: 4.20+-0.05V
Max. Continuous Discharging Current: 30A

Sony VTC4 18650