An aerosol provision device is described comprising: a battery; an antenna for receiving radio frequency signals and a charging controller configured to charge the battery with power extracted from the received radio frequency signals. The antenna is extendable so as to increase an exposed surface area of the antenna. A case is also described comprising means for electrically coupling the case to the aerosol provision device; an antenna for receiving radio frequency signals; and a charging controller configured to charge a battery of the aerosol provision device and/or the case with power extracted from the received radio frequency signals.