Important: Do not run out of battery, that light the dark when you charge the battery, or can no longer charge.
Battery head for the tip structure to ensure good contact with the process.
Battery Type: Lithium Battery 18650
Battery capacity: 3000mAh
Nominal Size: OD 18MM, highly 66.5MM, please note that this size than we used much larger cell size 5. Please do not buy the wrong battery
Battery Voltage: 3.7V
Scope in bright flashlight, camera, etc