For instance, if you leave your phone charging all night (say 8 hours)… it stays at 100% for hours while continuing to be plugged up and charging. Where does this extra electricity go if the battery is already full?
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The phone’s battery circuitry is fully capable of independently balancing battery load with incoming available power, and disconnecting or reconnecting as needed. Older batteries may have had problems with this, but modern phones, not so much. We’ve gotten very good at battery state management even while battery lifespans (duration and cycles) are flattening out.
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