This cylindrical 18650 cell is a rechargeable battery that is widely used in a variety of devices, ranging from small flashlights, security cameras to electric cars. The battery has a nominal voltage of 3.7V and a nominal capacity of 2500mAh, which means it can provide a steady and reliable stream of power to your device for an extended period of time. The battery measures 18mm diameter and 67mm length. It's compact and lightweight, making it easy to transport and install in a wide variety of devices. Whether you need to power a small flashlight or a security camera, this rechargeable battery is a reliable and efficient choice. This is a 'button top' battery - Not Flat Top. Generally used for rechargeable flashlights, cameras, doorbells, smart devices etc