The core, the engine of every electronic cigarette is the battery, it stores energy and is released when the user operates the e-cigarette. There are many types of batteries on the market which vary in size, capacity, duration, voltage, wattage, and resistance.

Size of e-cig battery

The size of the battery is expressed with a five-digit number where the first two indicate the diameter expressed in millimeters, while the third, fourth and fifth indicate the length expressed in tenths of a millimeter.


The acronym mAh (Milli-Ampere) in the technical characteristics of the battery indicates the intensity of current that is supplied by the battery over a certain period of time. This measure is related to the battery life, so it is the capacity, the longer the battery life. The most popular battery format is 18650.