iPhone Battery Health, Service, Calibration

We recently purchased a used iPhone 11 PM.

It had been unused in storage for months.


From Settings > General > About > Parts & Service History it shows "Battery - Service."





When you click on that it takes you to Settings/Battery.


Then selecting Battery Health & Charging you see Max Capacity 91%* with the disclaimer "...system is recalibrating Maximum Capacity. This process may take a few weeks."



Additionally, using Coconut Battery, it gives the impression the battery manufacture date (01-06-2020) is only weeks older than the phone's manufacture date (02-03-2020), so it must be the original battery. CoCo also indicates the Battery Health is currently 91.7%.





Logic would lead me to believe that the Parts & Service History message, where it shows "Battery - Service" may go away once calibration is complete, AND if the updated Battery Health is > 80%. But I see nothing like this scenario on any Apple web pages that discuss Parts & Service History, nor Battery Health.


Has anyone experienced this before and can validate whether my assumptions are correct?


We really like this phone and want to keep it!


iPhone SE, iOS 16

Posted on Mar 16, 2025 1:20 PM

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Question marked as Top-ranking reply

Posted on Mar 16, 2025 4:52 PM

Never let it discharge to 0%. No need to turn off any WiFi, Data or anything else. Just let is charge to the full 100% for several charge charges over a couple of weeks. Preventing it from charging to 100% will stop it from Calibrating. I am currently on iOS 18.3 and you are not doing yourself any favors by not updating from iOS 18.2. When you have a free half hour, just update it and let it do its thing while it is plugged into power.


If you still see the same message in the Battery Settings showing after several weeks of charging, then take it to Apple for a free diagnostic. Some important points in the Apple Support article dealing with Calibration is here in addition to the message you would see if Recalibration is not successful:

  • If the recalibration of battery health reporting indicates that your battery health has significantly degraded, the battery service message will appear.
  • While the battery health reporting system is recalibrating, you will see a message in Settings > Battery > Battery Health. Recalibration of maximum capacity and peak performance capability happens during regular charge cycles, and this process might take a few weeks.

About recalibration of battery health reporting in iOS 14.5 or later - Apple Support

24 replies

Mar 16, 2025 5:35 PM in response to croloriarc295

“I hope you’re not trying to contribute irrelevant statements to my authority on battery maintenance systems.”


Im curious as to the source of your authority on statements and guidance about batteries? Are you an electrical engineer, you work for a battery manufacturer, maybe you’re just well read. It’s all good, but I see no links to back up your statements.


I see no reason to take your statements as anything else but personal opinions. In fact opinions that don’t coincide with multiple manufacturers and well known authoritative sources found easily on the web.

Mar 16, 2025 5:56 PM in response to croloriarc295

What makes my opinion less informed than yours. What criteria are you using to evaluate your personal opinion and hold mine in low esteem? You must have some site or sources that makes you opinion more valid than mine. You can’t go around criticizing other community members opinions and elevating your opinions to facts.


However, here is a fact. You have not cited a single source backing up your opinions. We all have prior knowledge. My experiences are pretty extensive too. Let’s not waste each other’s time. Share your personal opinions and experiences (they’re all welcome) and label them as such and we’ll all get along. But claiming your opinions and experiences are more valid really needs citations. 😀

Mar 16, 2025 7:50 PM in response to croloriarc295

croloriarc295 wrote:

I hope you’re not trying to contribute irrelevant statements to my authority on battery maintenance systems. For one- reference to ios 14. from advice through a link would certainly be dated and insignificant.

Comprehension is the key to learning and by reading the article supplied by Apple, you could clearly see it for iOS 14 and Later and not only that the article was updated September 16, 2024. You read that as dated and insignificant, which is concerning. It was actually factual, relevant, and updated documentation provided by Apple that you could learn from. I would take that as more authoritative than any self proclaimed knowledge on all things related to battery performance on an iPhone. In fact, it was the only relevant documentation that has been provided, and still you have offered NONE.


It is a ridiculous claim to make that you should shut off WiFi, Cellular, and now Background App Refresh before charging your battery. Did you know that Background App Refresh does not stop Background Processes on your phone and they will continue to run whether you have that turned off or not.

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iPhone Battery Health, Service, Calibration

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