This rechargeable Lithium-Ion battery from Nitecore has a capacity of 3500mAh. Very suitable for devices with high energy consumption such as flashlights. The battery is charged outside the flashlight so you can charge your empty battery while using the flashlight on a second battery. You can charge this 18650 battery on average 500 times. This battery is equipped with a protective circuit that protects the cells against overcharging, over-discharging and short-circuiting. 18650 Lithium-Ion batteries guarantee a very long burning time and work well at low temperatures.