A standard pod system can be further sorted into two categories:refillableandpre-filled.
Some have button power batteries while other are automatic, meaning you just have to take a drag to power them
Pod systems:provide a low-powered pull, using higher nicotine strengths with integrated pods instead of tanks.
Open Vape Pod Systems: uses replacement pods that can be filled with any nicotine salt e-liquid. This replacement pods give the users the freedom to choose their own favorite liquid to pair with their devices, these devices utilize empty pods that are manually filled by the user,SMOK, VAPORESSO, IJOY, UWELL, and VOOPOO are the top contenders for Open Vape Systems
Refillable pod Systems:Also known as open systemThe main advantage to them is that you have a wider range of flavors at your disposal.