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 telephone regulates the current it draws to trickle charge the battery and compensate the power drawn from keeping the device running. It measurs how full the battery is by its voltage and gradually decreases the charging current. You might feel the power supply unit getting warm at the beginning of the charging session, and then cool down because it doesn’t have to do as much work.
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