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I've read in Apple discussion forums that it doesn't.
But at the same time, I've also noticed that whenever I fast charge it (by either using iPad charger or through the Thunderbolt port from my Macbook), the phone gets hotter compared to normal 5W charging.
And I've heard heat isn't good for battery life.
Thanks.
iPhone XS Max, iOS 13
Fast charging will not hurt your phone. Yes, it gets warmer (2nd law of thermodynamics), but it's still within the normal operating range for the phone. And, as it charges faster, it is at that higher temperature for a shorter time.
But unless you are in a real hurry there's also no benefit to charging it faster. Just charge it overnight, and won't matter how long it takes. And as an added benefit you can enable the nightly automatic backup to iCloud.
Fast charging will not hurt your phone. Yes, it gets warmer (2nd law of thermodynamics), but it's still within the normal operating range for the phone. And, as it charges faster, it is at that higher temperature for a shorter time.
But unless you are in a real hurry there's also no benefit to charging it faster. Just charge it overnight, and won't matter how long it takes. And as an added benefit you can enable the nightly automatic backup to iCloud.
Thanks a lot Lawrence.
Can I ask you another question? What's your advice on using Qi-certified wireless chargers?
If Apple doesn't make them ( I know Belkin ones are sold on Apple.com and in stores, but no Apple branded wireless chargers are sold), is there a reason why Apple chose not to?
Is it more advisable to charge iPhones from Lightning connector over wireless charging?
It makes no difference as far as the phone is concerned what kind of charger you use. From an energy efficiency standpoint a wired charger wins, because there is energy lost to the environment with a wireless charger, but I don’t think it’s material in the overall scheme of the universe. Apple announced a wireless charger a couple of years ago that would charge multiple devices including Apple watches, but it never made it out the door. There are so many out there and they are so inexpensive that I guess Apple didn’t see any profit opportunity.
Another question after I read the article/article is below.
If the iPhone stops charging automatically once it's almost 100% charged ( I know you said it usually never charges to 100%), why would they need to introduce a new feature in iOS 13 called "Optimized Battery Charging" in WWDC2019.
https://www.macrumors.com/2019/06/05/ios-13-optimized-battery-charging/
It mentions things like - "the optional toggle learns from your personal habits and waits to finish charging all the way up until you need your iPhone."
"Avoiding topping up the battery continually while it sits on the charger reduces the amount of time that your device spends at maximum capacity, and over time, this could extend the life of your battery."
This doesn't seem to fit with the idea that - there's much to worry about charging - and basically I can put my phone to keep charging the whole night.
Could you please elaborate on this too?
Thanks
It does fit with what he said but with the optimized charging it is possible to maintain the overall health of the battery longer. How much longer is not really known at this time since it isn't widely available yet.
A Li-ion battery will degrade slightly faster if it is left at full charge for long periods of time - days or weeks, for example. Apple has always recommended leaving devices at half charge if you are going to store them for long periods of time. But I doubt that a few hours at full charge will make any difference. And if you leave the phone connected after it reaches full charge then your power source is operating the phone, rather than the battery, which reduces the number of full charge cycles that the battery will go through and will thus extend the battery life. I think this new "feature" is just a gimmick, because I doubt that anyone uses the phone in exactly the same usage cycle every day.
It's interesting you calling a feature announced at an Apple event a "gimmick" - especially on a discussion forum at Apple.com.
But I get your point.
Not sure about others - but I definitely use my phone almost the same way - charging it overnight and getting up almost at the same time everyday. So their "gimmicky feature" will be interesting to see at play for me.
I'm a user like you; we're almost all users in Apple Support communities. We can say anything we want within the limits of the terms of use. It means that we can give unofficial advice; Apple employees are constrained by limits set by their legal department.
Apple's participation is minimal; Community Specialists are Apple employees, but they only respond to posts that haven't been answered in a day or so, and they can only post information from Apple's support knowledge base.
Does fast charging an iPhone degrade it's battery life?
