iPhone 15 charging optimization limit exceeds 80%

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

Posted on Sep 30, 2023 1:04 PM

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Question marked as Best answer

Try to turn off charging restriction, restart the phone, set the 80% option again and let it charge. In my case two times it charged the batt to 100 and now it always stops at 80. But I think that in some time it will charge to 100 again to just calibrate.

Posted on Nov 14, 2023 9:48 AM

2 replies
Question marked as Apple recommended

Sep 30, 2023 1:21 PM in response to Harbeth

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


Question marked as Helpful

Oct 1, 2023 5:24 AM in response to Harbeth

Harbeth wrote:

It did it again, unfortunately. It charged to 100%. Could the fact that I was using a cheap generic USB-C cable have anything to do with the problem?

Unlikely. I'm seeing similar behaviour using all-Apple cables and power adaptors.


I suggest changing to Optimized Battery if there is a setting for this in your charging options (it may vary a little depending exactly which model and software version). Settings > Battery > Battery Health & Charging


This is a relatively minor problem and will not harm your new iPhone if it charges to 100% a few times. It might make a very small difference in long term usage, but I expect this problem to be resolved sooner rather than later.

18 replies
Question marked as Apple recommended

Sep 30, 2023 1:21 PM in response to Harbeth

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


Oct 1, 2023 5:18 AM in response to Harbeth

There are two possible causes

(a) (unlikely) The battery was fully charged when you started, and had only dropped to 86% by the time you looked.

(b) A software bug. Based on my observation of something similar with my iPhone 15 Pro Max, I think this is the likely cause. It should be fixed in a future software update, and speed of action will depend how many bug reports Apple gets for it.


Please post bug reports to the official Feedback pages for the device involved.

Feedback - iPhone - Apple

Question marked as Helpful

Oct 1, 2023 5:24 AM in response to Harbeth

Harbeth wrote:

It did it again, unfortunately. It charged to 100%. Could the fact that I was using a cheap generic USB-C cable have anything to do with the problem?

Unlikely. I'm seeing similar behaviour using all-Apple cables and power adaptors.


I suggest changing to Optimized Battery if there is a setting for this in your charging options (it may vary a little depending exactly which model and software version). Settings > Battery > Battery Health & Charging


This is a relatively minor problem and will not harm your new iPhone if it charges to 100% a few times. It might make a very small difference in long term usage, but I expect this problem to be resolved sooner rather than later.

Oct 14, 2023 12:23 AM in response to Harbeth

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…

Oct 16, 2023 10:47 AM in response to Harbeth

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)?

iPhone 15 charging optimization limit exceeds 80%

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