no, charging your iphone overnight does not destroy the battery - lithium ion polymer battery

You may have heard that charging your iPhone is not good for the battery.
According to Battery University, a website operated by Cadex, charging a phone when it's already fully charged will keep it highstress, high-
Tension state, wear and tear the chemicals inside and cause lasting damage.
We ignore this.
Tech author Jesse holrington tells you everything you need in a wonderful and comprehensive Quora answer to how the smartphone battery works: "charging the iPhone overnight will not cause your battery
"Charging your iPhone from 90% will also not damage your battery.
So you can't charge too much for the iPhone or any other modern electronic device.
"Any device that uses a lithium ion or lithium polymer battery must contain a charging circuit that cuts off the charging power when the battery reaches 100%", basically the smartphone battery is the same as the phone itself
Apple, Samsung and all the top tech companies
Almost all products using lithium
Battery-based-
Use this best practice.
There is more: "The rated charging cycle of lithium ion batteries is limited (
About 500 in case of iPhone)
, The term "charging cycle" refers to full charging, and partial charging only uses a partial charging cycle.
"In other words, every time you charge your iPhone from 90%, you're using 1/10 or 10% of a full charge cycle.
"However, if you deliberately drain the battery to zero and charge it instead of simply plugging it in when you need to charge, you unnecessarily run out of a full charging cycle.
"Obviously, it's fair if you use the iPhone before the battery is dead, but there's no need to deliberately drain it before charging, and if you do, you'll actually shorten your battery life.
"That's how you left.