There seems to be a lot of rumours at the moment that iPhone batteries are swelling and damaging phones because of being overcharged, is there any truth to this rumour?

My granddaughter has informed me (after having her iPhone 4 repaired, for a broken screen) that she was told by the repairer that charging a phone overnight every night will not only overcharge the battery (and reduce the life off the battery), but also can result in the battery swelling and breaking the screen and/or the back glass of the phone.
I have googled this question and observed that there are 50/50 remarks within a variety of blogs about this, (it seems there are a lot of rumours about overcharging) obviously there are some really silly responses to the "overcharging" theory, and some that do seem to almost come with some authority. Some say charging every night will definitely damage the battery, some say it will definitely not damage the battery.
I personally don't believe these rumours to be true, but thought it best to ask the experts, hence this question.
Please let me know if there is any truth to this rumour, so that I can reassure not only myself, but also my children and grandchildren, who are now scared of charging their phones.

dougwatkins wrote:
My granddaughter has informed me (after having her iPhone 4 repaired, for a broken screen) that she was told by the repairer that charging a phone overnight every night will not only overcharge the battery (and reduce the life off the battery), but also can result in the battery swelling and breaking the screen and/or the back glass of the phone.
What is true is that the vast majority of swelling/exploding/flaming batteries in iPhones that have been documented can be traced directly to botched repairs by unauthorized servicers or to counterfeit batteries sold on ebay and elsewhere.
Though any rechargable battery can fail, it is extremely unlikely in an unmodified, undamaged iPhone.  If your granddaughter had her phone repaired by anyone other than Apple, she is at more risk now of experiencing a catastrophic failure of the phone than she ever was.  She no longer has an iPhone. Apple will not service her phone at all if it was opened by a 3rd party.

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