The NITECORE NL189 3400mAh 18650 Rechargeable Li-ion Battery is specifically designed for Nitecore flashlights， providing constant and fast power supply. Made with high-grade material and fine workmanship， it is highly reliable and durable for long-term use. This battery is equipped with integrated overcharge and over discharge protection circuits. High-efficiency cores delivers a strong and stable performance. And its 3400mAh large capacity ensures long runtime. It is definitely a quality accessory you can count on. Don’t hesitate to get one now!                                    Features            Purpose-designed for high-performance equipment. Safe， environment-friendly， high-performance 18650 cell.With built-in PTC to inhibit high current surges.Microporous barrier protects delicate internal components.Pressure relief valve activates in the event of a rapid temperature increase.Innovative anode design with high temperature resistance.High performance. A high output current of up to 4A makes NL183 compatible with various kinds of high-drain devices.Actual measured capacity is approximately 3400mAh which is 15% more than a common 18650 rechargeable cell.Positive end is a standard button size allowing maximum equipment compatibility. Compatible with most brands of 18650 flashlights.Certified by RoHS，CE and UL                                                            Specifications            Function    Nitecore NL189 18650 Rechargeable Battery    <br>Capacity    3400mAh    <br>Voltage    3.7V    <br>Electricity    12.6Wh    <br>Charging Current    Maximum 2A. (1A Current recommended)    <br>Diameter    18.4mm    <br>Length    69.2mm    <br>Charging Cycle count    More than 500 charge/discharge cycles    <br>Weight    2.08oz / 59g    <br>                                                            Package Includes            1 x Nitecore NL189 18650 Battery