Single nominal voltage is generally: 3.6V or 3.7V charge voltage is typically: 4.20V minimum discharge termination voltage is generally: 2.75V, below this voltage easily lead to a serious decline in battery capacity and even scrapped maximum charge voltage: 4.20V Diameter : 18 ± 0.2mm height: 65 ± 2.0mm advantages of a large-capacity lithium battery capacity of 18650 is generally between 1200mah ~ 3100mah, and general battery capacity is only 800 or so, if combined into a 18650 lithium batteries, lithium batteries that 18650 group is casually breakthrough 5000mah's all OK. 2, long-life lithium battery, long life 18650, during normal use cycle life up to 500 times, more than twice the normal battery. 3, high safety performance of high performance 18650 lithium battery safety, no explosion, no fire; non-toxic, non-polluting, after RoHS trademark certification; various safety performance in one, more than 500 times the number of cycles; high temperature performance, 65-degree conditions discharge efficiency up to 100%. To prevent battery short circuit, positive and negative 18650 lithium batteries are separated. So it happened a short circuit may have dropped the extreme. You can install a protective plate to prevent battery overcharge and over discharge, which can extend the battery life. 4, high voltage 18650 lithium battery voltage is generally in the 3.6, 3.7, much higher than nickel-cadmium and nickel-metal hydride battery voltage of 1.2V. 5, no memory effect before the remaining battery charge does not have to be vented, and easy to use. 6, the resistance is small: polymer batteries internal resistance than ordinary liquid batteries small, domestic polymer batteries internal resistance can even do 35mΩ or less, greatly reduce the battery from the power to extend the phone's standby time can be achieved with the international level. This support large discharge current lithium polymer is ideal for remote control model to become the most promising alternative to nickel-hydrogen battery products. 7, can be connected in series or parallel combinations to 8 18650 lithium batteries, widely used in various electronic fields: commonly used in high-grade bright flashlight, portable power, wireless data transmission, electric warm clothing, shoes, portable instrumentation, portable lighting equipment , portable printers, industrial equipment, medical instruments. http://18650huolan.1688.com/