Device and method for supplying an electric device with electrical energy

The device (100) has an energy storage (101) i.e. lithium-ion accumulator, for supplying electrical energy. A controller (102) controls charging of the energy storage with electrical energy from a power grid (300) at low load condition of the power grid based on a control signal that is transmitted by the power grid. A connection device connects the device to the power grid, and is designed to receive the energy and control a signal from the power grid based on smart-grid-technology. A bypass device is coupled with the controller. An independent claim is also included for a method for supplying an electrical device with electrical energy.