A case for an aerosol-generating device is provided, including: a case housing; a holder to receive the device and being movable with respect to the case housing between a closed position in which removal of the device from the holder is prevented and a docking position in which the device is removable; a case power supply within the case housing; a case electrical connector to supply power to the device received within the holder; a charging connector to receive power from an external power supply; a sensor to sense a position of the holder and to generate a signal indicative of the position; and a controller to receive the signal from the sensor, supply power to the case power supply when the signal indicates the holder is the closed position, and supply power when the signal indicates the holder is in the docking position. A charging system is also provided.