An electrically heated aerosol-generating system

The present invention relates to a method of controlling an electrically heated aerosol-generating system. The electrically heated aerosol-generating system comprises a charging device comprising a rechargeable power supply, and an electrically heated aerosol-generating device configured to receive an aerosol-generating substrate comprising a rechargeable power supply, and at least one electrical heating element. The method comprises: monitoring the ambient temperature adjacent the charging device; determining a charging current, for charging the rechargeable power supply of the charging device, in dependence on the ambient temperature; and charging the rechargeable power supply of the charging device at the determined charging current. The invention further relates to a system and device for carrying out the method.