Is it posible to over charge an iPhone battery?

Will it harm the battery of an iPhone to leave on the charger over nite?

Yes I've learned that it does I always use to leave mine charged all night & now the battery is starting to have problems

Not with a properly functioning charger.

The battery will get to 100% and remain being charged which will cause it to hold charge less. The battery will basically start lasting for less and less time the more you over charge it

No I do this all the time and have never had a problem.

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