The 50S 21700 battery from Samsung has a capacity of 5000 mAh and a discharge current of 35 amps. It offers an excellent compromise between autonomy and power to be used with a meca or electro mod. Capacity: 5000mAh Rated voltage: 3.6V - 3.7V End of charge voltage 4.20 V ± 0.05 V max discharge current: 35A Diameter: 21.3mm Height: 69.8mm