18650 diameter 18.4 mm height 65 mm stable 35A current charge and discharge times in 1000 the battery capacity of 2600 mAh standard voltage 3.7 V full charge voltage 4.2 V Note it operates when the voltage is reduced, voltage can not be lower than 2.7 volts, otherwise the battery would be damaged.18650 rechargeable Li-ion battery Durable and long lifespan Capacity: 3800mah Voltage 3.718650 protected rechargeable li-ion lithium battery Suitable for laser pointer, flashlight torch and other electronics products Safe and environmental friendly Rechargeable Times: Up to 500 times Model: 18650 Battery Type: Lithium-ion J Battery Rechargeable. For Camera, Flashlight, standalone fan etc Battery Capacity:  18650  3800 mAh 3.7V. 18650 diameter 18.4 mm height 65 mm stable 35A current charge and discharge times in 1000 the battery capacity of 2600 mAh standard voltage 3.7 V full charge voltage 4.2 V Note it operates when the voltage is reduced, voltage can not be lower than 2.7 volts, otherwise the battery would be damaged.18650 rechargeable Li-ion battery Durable and long lifespan Capacity: 3800mah Voltage 3.718650 protected rechargeable li-ion lithium battery Suitable for laser pointer, flashlight torch and other electronics products Safe and environmental friendly Rechargeable Times: Up to 500 times Model: 18650 Battery Type: Lithium-ion J Battery Rechargeable. For Camera, Flashlight, standalone fan etc Battery Capacity:  18650  3800 mAh 3.7V