A charging case for an aerosol-generating device, the charging case including a case connector for receiving electrical power from an external source, a plurality of case cavities, a mounting section for connecting the aerosol-generating device to the charging case, and a case control unit. Each of the plurality of case cavities being configured to receive at least one of a plurality of power sources. The case control unit arranged to charge a first one of the plurality of power sources via the case connector using electrical power from the external power source and charge the aerosol-generating device connected to the mounting section via a second one of the plurality of power sources, or via the case connector using electrical power from the external power source.