Abstract: Battery cells, each including an electrolyte, first and second working electrodes in the electrolyte, and first and second reference electrodes in the electrolyte, are disclosed. The first and second reference electrodes each comprises an active material on a current collector. The active material of the first reference electrode is different from the active material of the second reference electrode.

Abstract: In one aspect, the invention relates to a method of compensating a broadcast source. The method includes the steps of delivering a plurality of content elements originating from a broadcast source to a receiver; generating a playout list of the plurality of content elements, identifying the broadcast source, identifying one content element of the plurality of content elements; and compensating the broadcast source if the user of the receiver purchases an item associated with the one content element.