Abstract: A removable fluid fuel cartridge has an integrated content module. The cartridge/content module includes a cartridge housing, a fuel reservoir and a content module incorporated in the cartridge. The cartridge housing fluidly connectable to the fuel inlet of at least one electrochemical fuel cell providing electric power to a mobile electrical device. The fuel reservoir is disposed within the cartridge housing for containing a quantity of fuel capable of being directed in a fluid stream to at least one fuel cell for accommodating an electrochemical reaction capable of supplying electrical power to the device. The content module is incorporated in the cartridge, and is independently capable of producing a perceivable stimulus.