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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~~It changes to trickle charge.~~ The phone decides to only accept as much electricity as it needs. Newer phones will stop charging at 80 percent and start to charge the rest slowly until you get up.
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