The new generation 18650 rechargeable Li-ion battery is 3000mAh large-capacity with protection circuit in the anode so it can be fully covered with steel shell and eliminate potential risk of short circuit caused by collision and impact.One 18650 battery can be recharged for more than 500 times. New generation with protection circuit in the anode Over 500 times full charging cycles Environmental friendly and low cost Tech specs Capacity: 3000 mAh Voltage: 3.7V Size Weight: 50 g Diameter: 18.6 mm Length: 69 mm