Become a MacRumors Supporter for $25/year with no ads, private forums, and more!


macrumors bot
Original poster
Apr 12, 2001

With the release of iOS 14.5, Apple introduced a new process for recalibrating the battery health reporting on the iPhone 11, 11 Pro, and 11 Pro Max.


The update recalibrates the maximum battery capacity and peak performance capacity on ‌‌iPhone 11‌‌ models to address inaccurate estimates of battery health reporting that some users have encountered.

Symptoms of this bug include unexpected battery drain behavior or in some cases, reduced peak performance capability, but these issues should be fixed after installing the update.

Once you've updated your iPhone 11 to iOS 14.5 or later (Settings -> General -> Software Update), you'll see a message in the Settings app under the Battery -> Battery Health section informing you of the recalibration process.


Note that the process can take a few weeks to complete after updating your device. This is because recalibration of the battery's maximum capacity and peak performance capability takes place over the course regular charge cycles.

It's also worth bearing in mind that the displayed maximum capacity percentage won't change during recalibration, and while peak performance capability might also be updated, it may not be noticeable.

Only when the recalibration is complete can the maximum capacity percentage and peak performance capability information be regarded as accurate. If the recalibration indicates that battery health has indeed significantly declined, you'll see a battery service message.

In some cases, your iPhone 11 battery's recalibration may not be successful and a battery service message will pop up. In such cases, Apple will replace affected batteries free of charge to restore full performance and capacity to your device.

Article Link: iOS 14.5: How to Recalibrate Your iPhone 11 Battery
Last edited:
  • Haha
Reactions: GSWForever8


macrumors member
Feb 5, 2021
When the recalibration happen to my iPhone 11 Pro Max. Nothing changed was still at battery health 91%


macrumors newbie
Apr 27, 2021
Mine is an iPhone 11 green I bought 6 days ago and it went from 100% battery health and terrible battery drain (iOS 14.4.2) to 100% battery health (yeah it remain the same) I still got the battery recalibrate message why? I don’t know maybe it now has to fix the battery drain bug time will tell I hope since it takes few weeks and kinda better battery usage now it sill drain but better than before


macrumors 601
May 14, 2012
Well find out later this aggravated battery life expectancy and shouldn’t have been applied. :rolleyes:


macrumors newbie
Apr 27, 2021
Same here 88 to 100. When should be 90% like coconut battery program
Mine is still 100% battery health from iOS 14.4.2 to 14.5 and I still get the message maybe now it has to fix the battery draining and the battery usage is kinda improved it still drain but better than before and i bought it 6 days ago

now i see it

macrumors 604
Jan 2, 2002
While the Battery Health statistic may have been grossly inaccurate on the iPhone 11 with previous versions of iOS, it is still not accurate on any iPhone on any version of iOS. It never has been and never will be.
-Ignore It-
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.