Mini Butterball 8pcs 18650 5000mAh 3.7V Li-ion Rechargeable Protected Batteries for LED Flashlight Mini Fan High performance 18650 3.7V 5000mAh Li-ion rechargeable battery. Low discharge rate, no memory effect. Short-circuit and over current protection & Environment friendly Provides excellent continuous power sources to your devicev Suitable for flashlight torch, laser pointer, as emergency lighting and other portable devices.