Nitecore NL1840HP Li-Ion Battery Power for High Drain Devices If your favorite flashlight has high power drain demands, use the Nitecore NL1840HP! With a maximum capacity of 4000mAh, voltage of 3.6V, and discharge current of 10A, this 18650 battery is the ideal power source for high drain flashlights or other heavy duty devices. Its lifespan of 500 charge cycles makes it a reliable, reusable 18650 for years of use, and so your flashlight never stays dead for long! Safe Power With its abrasion resistant metallic film and nickel-plated stainless steel protectors, this battery resists scratches, oxidation, or falls with ease, keeping your gear going in tough conditions. Its internal protections prevent over discharge, overcharge, and short-circuiting, letting your flashlight perform at peak condition for hours on end. This 18650 is also constructed without cadmium, lead, or mercury, making it environmentally friendly and safe for use in your most demanding devices.