Vapcell K15 3.7v Rechargeable Li-ion Battery: Size: 18mm x 50mm Capacity: 1500mAh, 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 18500 K15 1500mAh Flat Top Rechargeable Battery & 1x Storage Case