An electronic device having electronic circuitry powered by a battery and having an interface for interactively coupling the electronic device to a host device, for switching {TAIL ~ the power source} by which {HEAD ~ power} is supplied to the electronic circuitry, and by determining an interface status as being coupled to or detached from the host device 
An electronic device having electronic circuitry powered by a battery and having an interface for interactively coupling the electronic device to a host device , for switching { TAIL ~ the power source } by which { HEAD ~ power } is supplied to the electronic circuitry , and by determining an interface status as being coupled to or detached from the host device
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