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The number "18650" refers to the battery's dimensions. It is 18mm in diameter and 65mm in length, making it a standard size used in various electronic devices and applicationsThe 18650 battery is a type of lithium-ion (Li-ion) battery. Li-ion batteries are known for their high energy density, low self-discharge, and ability to provide a high current output.Typically has a nominal voltage of 3.6V to 3.7V, which is lower than the voltage of primary (non-rechargeable) lithium batteries.The capacity of an 18650 battery is usually measured in milliampere-hours (mAh) or ampere-hours (Ah). Common capacities range from 2000mAh to 3500mAh, though higher capacities are also available. Capacity indicates how much charge the battery can store and how long it can power a device.