Abstract: A heating device for liquid to warm the liquid and keep the temperature for a longer period of time for the portable use of the cup has been invented. The heating device in the present invention comprises an electronically wired removable cup and a sleeve wherein said cup filled up with liquid is inserted for the heating purpose and the heating process starts through the electronic wires embedded in a heating cup when an electronic switch is activated. The heating elements embedded or equipped within a cup, not within the housing, in present invention keeps the liquid in a cup hot for a longer period of time, for the portable use of the cup. In addition, the electronic power through the cord can be activated or blocked out by a switch on the cord and the cord may also connects with automotive plug, to fit an electric cigarette lighter socket of a vehicle, for various portable use of the cup.