An energy recovery apparatus for a plasma display panel is provided that may include a capacitor equivalently formed at a discharge cell, an inductor, an energy recovery capacitor, switching units and a voltage sustain diode. The connector also includes a second connector portion including a second array of board contacts for connection to a second corresponding footprint on a second circuit board. When the battery-operated device is turned on, the switch is closed and the timer is reset and started so that power saving device provides a conductive path between the batteries. The injected feedgases thereafter mix in a mixing portion of the channel. According to another embodiment, downloaded data content is adapted for use only with a particular software component that establishes a connection with a data content service provider system to obtain permission to use the data content. The compositions and methods are also useful for coating non-biological surfaces such as metallic surfaces.