There are two main different types of batteries, since the term "battery" has multiple meanings when it comes to electronic cigarettes. The first type being the Ego style batteries, which are slim devices with an internal battery and ego/510 threading on the top. These style of batteries work best with old school vape clearomizers and are very popular with CBD Cartridges. The second type of vape battery is the external battery, such as 18650/20700/21700 batteries. These batteries are used with high power vape devices since they can provide enough power to fire the device and provide long battery life. The external batteries do require more knowledge of how they work, must ONLY be charged on external battery chargers, and must not be misused. The user must follow all warnings associated with these batteries.