When it comes to the type of battery, vapes can either come with an inbuilt battery or with replaceable batteries. Almost all inbuilt batteries are Lithium-Ion. This means they use lithium strips and a gel core to produce a current. When it comes to replaceable vape batteries, you can choose between the industry standard 18650 battery and a relative newcomer, the 21700 battery cell. Since 21700 are a recent addition to the rechargeable battery family, there are only a handful of vape mods that use them. This is why many of these vapes come with an adapter for a 18650 battery. 18650 battery cells are the industry standard when it comes to vape mods. They're quite slim, compact, and can be found just about anywhere. These batteries are used in laptops, portable power tools, cars, flashlights, and many other devices. 18650 batteries are built by almost every large tech brand, including Samsung, LG, and Sony. In fact, some of the best vape mod batteries are manufactured by Samsung and Sony. If you're looking for the best 18650 battery, we recommend you stick with better-known brands. The market is saturated with cheap knockoffs that can potentially damage your vape.