Vapcell P50 3.7v Rechargeable Li-ion Battery: Size: 21mm x 70mm Capacity: 5000mAh, Voltage: 3.7V, Max Continuous Discharge: 15A, Flat Top (NOT Button Top), No Memory Effect, High Energy Density, & Pollution-free What you get: 2x Vapcell 21700 P50 5000mAh Flat Top Rechargeable Battery & 1x Storage Case