If you currently have a 3 part e-cigarette (battery, atomizer, cartridge) that you bought somewhere else, you can turn it into a 2 part e-cigarette by repalcing the atomizer and cartridge with a Refill Cartomizer.
The same battery can be used for both a 2 part and 3 part electronic cigarette. Please choose the correct cartomizer with the correct thread for your battery type. To learn more about 2 part e-cigarettes go to the FAQs Page.