What is the most common vape battery?

18650 battery
The 18650 battery size is the most common batteries in vaping. They are readily available, reliable, extensively tested, and the vast majority of mods come with 18650 compatibility.

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What’s the difference between 18650 and 21700 batteries?

Many wonder what the difference between a 21700 battery and a 18650 battery. From a physical aspect, it is simple; the size is the difference. 21700 batteries are slightly larger than 18650 batteries! Being that the 21700 battery is slightly larger, it will also provide more energy/power and runtime.