A disposable e-cigarette is an e-cig that comes ready to vape and is thrown away once it runs out of charge or e-liquid. Most e-cigarettes need to be refilled, either by refilling the e-liquid in the clearomizer or by changing the tank. A disposable, however, is different. Disposables are designed to be used and thrown away once the e-liquid has run dry. They don’t need to be refilled and they can’t be charged. Simply use them and dispose of them.