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Betavolt's miniature battery could spell the end of smartphone chargers
(mobilesyrup.com)
This is a most excellent place for technology news and articles.
Just calculate an average day's energy example. Let's say, you charge your 5000mAh battery once per day from "10%" 2,6V to "100%" 4,2V. That makes about 8Wh. So your average for the whole 24 hours is 0,3 W, or 300 mW or 300.000 μW.