A first mobile device for sharing energy with a second mobile device , the first mobile device comprising: a battery ; a rectifier ; an inductive coil ; a charge sensor unit configured to identify a charge state of the battery of the first mobile device ; a user interface unit configured to receive an input about whether the first mobile device is set to a source mode or a load mode, wherein in the source mode the first mobile device operates to supply energy to the second mobile device and identifies the charge state of the battery such that the battery is prevented from being excessively discharged while supplying the energy to the second mobile device , and wherein, in the load mode, the first mobile device operates to receive energy from an external device; and an inverter , characterized in that the inverter is configured to, when the source mode is selected: - convert a thereto provided first direct current DC voltage provided from the battery of the first mobile device to a first alternating current AC voltage, and - supply the first AC voltage such that energy is transferred based on the first AC voltage to the second mobile device through the inductive coil ; the user interface unit is configured to output information on whether the first mobile device is operable in the source mode to supply the energy to the second mobile device based on the identified charge state of the battery of the first mobile device , and wherein, when the load mode is selected, the rectifier is configured to convert a thereto provided second AC voltage to a second DC voltage, and to provide the second DC voltage to the battery . a battery ; a rectifier ; an inductive coil ; a charge sensor unit configured to identify a charge state of the battery of the first mobile device ; a user interface unit configured to receive an input about whether the first mobile device is set to a source mode or a load mode, wherein in the source mode the first mobile device operates to supply energy to the second mobile device and identifies the charge state of the battery such that the battery is prevented from being excessively discharged while supplying the energy to the second mobile device , and wherein, in the load mode, the first mobile device operates to receive energy from an external device; and an inverter , characterized in that the inverter is configured to, when the source mode is selected: - convert a thereto provided first direct current DC voltage provided from the battery of the first mobile device to a first alternating current AC voltage, and - supply the first AC voltage such that energy is transferred based on the first AC voltage to the second mobile device through the inductive coil ; - convert a thereto provided first direct current DC voltage provided from the battery of the first mobile device to a first alternating current AC voltage, and - supply the first AC voltage such that energy is transferred based on the first AC voltage to the second mobile device through the inductive coil ; the user interface unit is configured to output information on whether the first mobile device is operable in the source mode to supply the energy to the second mobile device based on the identified charge state of the battery of the first mobile device , and wherein, when the load mode is selected, the rectifier is configured to convert a thereto provided second AC voltage to a second DC voltage, and to provide the second DC voltage to the battery . <EOS>