Buy authentic 18650 vape batteries from an approved UK vape supplier. 18650 batteries are the most common type of battery used within vape mods and kits. One of the most vital components of any setup, without a battery to power your device it would never function. The term 18650 refers to the size of the battery, with a 18mm diameter and a 65mm height. An 18650 battery has the capability of pushing out huge amounts of power whilst maintaining great battery life. Whilst some vape kits may contain an in-built battery cell, higher powered mod kits will require at least one lithium battery to power the device and the 18650 lithium battery has been accepted as the industry standard.