The coil can be a heating factor that vaporizes the e-liquid. It is actually made from a resistance wire wrapped all around a wicking material. The wicking materials incorporates the e-liquid. Use the right cable and adapter: Often use the cable and charger recommended via the manufacturer to stop overvoltage. https://rafaelpldtj.bloguetechno.com/new-step-by-step-map-for-rechargeable-disposable-vape-not-charging-reddit-73092590