Compared with the other pod systems in the vape market, Freemax Onnix Series Pod Systems have a larger battery capacity. Freemax Onnix 2 15W Pod Kit utilizes a REAL 900mAh internal battery, while Freemax Onnix 20W Kit contains a REAL 1100mAh internal battery. Both come with the Type-C and 1.5A Fast Charging function, it only takes 60 minutes to charge from 1% to 100%, which makes your device always have the power you need for a full day's use. As for you, which kind of Onnix Kits do you like better, Onnix 2 or Onnix 20W? Freemax Onnix 20W is designed for MTL and RDL vaping needs, while Onnix 2 is for high-strength MTL vaping needs. Both can meet your different needs.