What inconvenience is mentioned in the text?
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Soon enough, say some engineers, miniature wireless sensors will be located in spots where it would be
inconvenient, to say the least, to change their batteries – inside your body, within the steel and concrete
of buildings, in the dangerous innards of chemical plants. But today, even the most robust nodes can be
counted on to last only a few years. Ideally, engineers need wireless sensors that can last forever without
external power sources or battery changes. According to research presented in December at the
International Electron Devices Meeting, in Baltimore, that dream is within reach.
What inconvenience is mentioned in the text?