battery charging for night to morning
Does charging automatically stop when charging is complete?
This is when I charge my iPhone while I sleep and it stays on until morning.
iPhone XR
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No, it isn't harmful for the battery to keep it connected to the charger after charging has finished. The battery knows it is full and stops charging itself.
To be pedantic: It is harmful to keep the battery at 100% for an extended time (like more than a month). But the few hours while you sleep is completly fine.