Power switching means coupled to the interface monitoring means couples the electronic circuitry to the battery in response to the interface monitoring means determining that the interface is inactive and couples the electronic circuitry to {HEAD ~ the power receiving means} in {TAIL ~ response} to the interface monitoring means determining that the interface is active 
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Power switching means coupled to the interface monitoring means couples the electronic circuitry to the battery in response to the interface monitoring means determining that the interface is inactive and couples the electronic circuitry to { HEAD ~ the power receiving means } in { TAIL ~ response } to the interface monitoring means determining that the interface is active
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