I have my iPhone 15 charging optimization set to 80% limit. Today, I take my iPhone off the charger and the battery level reads 86%. Does anybody know why this would occur, and what could be done to prevent this from happening again? Thanks in advance for your response.
iPhone 15 Plus
From the Apple article:
About 80% Limit with iPhone 15 models
With iPhone 15 models, you can choose between Optimized Battery Charging, 80% Limit, and None.
When you choose 80% Limit, your iPhone will charge up to about 80 percent and then stop charging. If the battery charge level gets down to 75 percent, charging will resume until your battery charge level reaches about 80 percent again.
With 80% Limit enabled, your iPhone will occasionally charge to 100 percent to maintain accurate battery state-of-charge estimates.
This implies that it is around 80% not necessarily exactly 80% so it may still be working as intended. You could report it to Apple if you think it is a bug and not functioning correctly though
About Optimized Battery Charging on your iPhone - Apple Support
It seems on my iphone that the battery % show the % of max, if I set max charge limit to 80% then the 100% shown on the battery icon means 100% of 80%... i.e. 80%
Go to the settings and you will see the graph of actual % for last 24 hours or 5 days.
This is not a bug.
charging cycles are like this. The phone needs to keep the battery healthy and sometimes it need to charge it more than the set value you have to stress the battery to keep it lasting as long as possible.
happen me a
couple of times but nothing dangerous. Can doh be annoying.
I have the 16 Pro and it indeed randomly charges to 100% way over my 85% setting limit!
UPDATE: I have read some of the previous posts and it appears that random charging to 100 is not a bug but it is done by design. Thanks.
I shall try to charge to 100% in the 80% limit mode, to see if that will calibrate the phone somehow.
I want to follow up and let everybody know that the 80% limit charging optimization is now working fine. I extend thanks to the community for providing excellent information and helping me understand the matter.
Same situation… today my iPhone 15 Pro was left on the cable and it was charged to 90%… moreover… I thought it is some kind of error so I gave it a restart (vol up, vol down and power). And after the phone started the battery bar showed 94%! That is insane…
got the latest 17.0.3 iOS version and the charging is not like it is described…
Btw - is that a proper behavior that it worked only for a single charge after charging it to 100%?
Because after letting it charge to 100% next charging was till 80% and next one was again till 100%… I don’t get it… I don’t think that this batt calibration should be triggered so quick (or maybe there is something wrong with the battery or phone)?
Well, tried m4rw00 tips, but still no luck. The fifth charge still goes to 100% with the 80% limit on. I cannot understand why this is so buggy. On Samsung devices this works flawlessly. Come on Apple, fix it.
After a couple of weeks it happens to stop on 80, other times goes to 81… 82… kind of weird this behavior. I think, if occasionally it goes over 80 and fully charge would be nice to have some kind of alert that during that charge that will happen so we don’t unplug.
Sounds like you all have it better than me!! My phone can’t even stay connected it charges on and off repeatedly over and over again. “Intermittently” Mainly between 35-65% and then it stops charging at 80% every single time not a percent over with optimization turned OFF. It’s been like this since the day 1 and then they replaced the cable, the block, and the phone with all new Apple products and I still have the SAME exact issue. They refused a refund during the return period. I just gave up going to the store and calling since it was wasting all my time. I have a Black iPhone 15 Plus and it’s nothing but charging problems. I wish I only had the 80% limit problem. My phone is constantly vibrating while charging disconnecting over and over. Apple doesn’t care!!! They literally told me it’s your problem not ours! I was going to write to corporate but I’m too busy to deal with this nonsense. I talked to all the top tier technicians and they confirmed there’s an issue with my phone, and Apple Store is zero help at all. They send you on your way within minutes. Apple iPhone 15 all models has severe charging/battery issues. We’re all stuck with it until they figure out their “bugs” I update it every single update hoping they fixed it… but it’s been several months now. Good luck to all!
Mine stops at 80% every time with optimization turned completely off and charges on and off continuously vibrating until it gets there. They told me they weren’t fixing this bug and they were focused on black history month exclusive items. By the way this has been a bug/issue since the beginning of October with their update to “fix” the overheating issues. That’s the update that caused this bug. They still have yet to fix it months later on iOS 17.3… They won’t replace the phone, refund it under the return period or fix it since it’s “software” related. Good luck!
I wish mine charged to 100%. Seems like my issue is the opposite of all yours here. Mine stops at 80% with charging optimization off and also if I put 80% limit on. It also charges intermittently on and off while charging and seems to get hot as well. Very frustrating Apple can’t seem to find the issue, it’s been like this since the first original October update for the overheating issue.
Doesn’t matter what setting I use in battery settings it charges to 80% when using a mains charger & charges to 100% when using wireless charger. Tried all three settings which are all exactly the same. Please fix this problem Apple as there’s obviously a problem in iOS. Currently on iOS 17.3.1.
Today my iPhone decided to charge above 80% limit (which usually works fine) and charged to 100% at night. Around 3 am. Then even it was still connected to the charged it has lost 10% in just 3-4 hours. Usually I lose same amount during whole night.
It looks like iPhone decided to charge to 100% but then realized that 80% limit is on so started to drain more and more just to reach 80%. I don't know what is going on.
I am also wondering why I see status that iPhone right now is charged to 80% while in fact it is still above. I decided to turn off 80% limit for now just to reach full 100% because I was worried that something is broken and iPhone won't stop draining
I have the same problem. I am using the USB C cable and adapter that came with my M1 MacBook pro to charge my iPhone 15 pro max. I've selected 80% limit for charging but it goes beyond 90% if the charger remains connected. The charging should ideally stop after 80% is reached.
iPhone 15 charging optimization limit exceeds 80%
