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Nothing will happen to it if you did it twice but if you do it more often then Charging to 100% is reason why battery is dying so fast in the future. Max charging to 80% is ideal. iOS 13 has a feature when it will keep the battery at 80% until the phone determines, based on your charging pattern, to charge to 100% just prior to you being active on the phone. If you keep battery between 40-80%, you will extend life significantly, some go for the 30% to 90% mark. Don't let it drop below 20% either, both extremes are very bad for lithium batteries.
 
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Pro tip: you also don't have to worry about "closing" apps in the app switcher. Just leave them there.

Well, unless you want to use app switcher to get between apps you use regularly (instead of every app you’ve opened). 😉. Personally, having a bunch of apps on the switcher is clutter and drives me crazy. (or crazIER as the case may be.)
 
Maybe if you did that every night for the next 100 years, it potentially might but there’s still not any proof it would. But the 11 would be obsolete by then anyway
 
Won't be optimal for the battery.

If it were a good thing to leave it charged overnight, Apple wouldn't need to introduce the feature in iOS 13.
 
Don't hate science.

Li-ion cells have never liked extreme states of charge.

Tesla doesn't default to a 90% charge just for fun.
Every Apple lithium battery device every made has included industry standard SMART lithium battery charging technology. It is not possible to harm the battery by leaving it plugged in because all charging simply stops once the battery reaches capacity.

Howver, all lithium batteries (all batteries really) have a finite life span - they wear out over time and use and will need to be replaced.

But you can safely leave any Apple product plugged in indefinitely without harming the battery. In fact, that applies to every single lithium battery power consumer electronics device that conforms to global industry standards for SMART lithium battery technology.

Charging My iPhone Overnight Will Overload the Battery: FALSE
 
Every Apple lithium battery device every made has included industry standard SMART lithium battery charging technology. It is not possible to harm the battery by leaving it plugged in because all charging simply stops once the battery reaches capacity.

Howver, all lithium batteries (all batteries really) have a finite life span - they wear out over time and use and will need to be replaced.

But you can safely leave any Apple product plugged in indefinitely without harming the battery. In fact, that applies to every single lithium battery power consumer electronics device that conforms to global industry standards for SMART lithium battery technology.

Charging My iPhone Overnight Will Overload the Battery: FALSE

You provided an answer to a question nobody asked.

This is not about "overloading." The question is about battery health.

Decades of research has shown keeping li-ion for extended periods of high voltage (full charge) accelerates battery aging.

Instead of your Google search results, I'll trust info presented at seminars by battery researchers like Dr. Jeff Dahn. He has a bit more credibility and works for Tesla, unlike random posts on the Apple Support Forum.
 
I used to have bad battery anxiety. Android makes it WAY easier to obsess over this stuff. You can get multiple battery apps such as Accubattery and various others. Not only that, but you can even get real time battery temperature readings on the top status bar via a widget. Anything above 86F (I believe) is when it starts to very slowly add to the battery wear. Using a phone heavily will easily push it over 92F.

40-80 is true
100% charge being bad is true
Batteries hate heat, age and extremes

I stopped worrying about all of this because I rarely keep a phone longer than 12-18 months. Even someone who is on their phone all day won't see rapidly reduced battery time in 12 months. Not only that, but a new battery is chump change in the big picture. I feel "free" now that I just charge and forget. I do wish Accubattery was available on iOS, though.
 
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