The NL1836HP is a rechargeable 18650 battery featuring a 3600mAh capacity & internal protections. Use over 500 charge cycles!Safety FeaturesMicroporous barrier protects delicate internal components, coated with durable metallic film to guard against abrasionPurpose-designedHigh-performance protected circuitMercury free, lead free and cadmium free, low cost and environmentally friendlyCan be recharged over 500 times.Specifications Capacity: 3,600mAh Voltage: 3.6V (12.96Wh) Continuous Discharge Current: 8A Length: 69.8mm0.3mm / 2.75"0.01" Diameter: 18.6mm0.3mm / 0.73"0.01"