Battery indicator percentage error iOS14

This should provide some useful information→About recalibration of battery health reporting in iOS 14.5 - Apple Support

Did you see my earlier post?

This should provide some useful information→About recalibration of battery health reporting in iOS 14.5 - Apple Support

Go to Settings/Battery/Battery Health and see what it says. The symptom you describe is an indication of a failing battery. If there are no other issues with the phone Apple will replace the battery for $49.

adrionna129 wrote:

My percentage keeps showing the wrong one and it keeps turning off and when I turn it off and turn it back on it shows the wrong percent

What model phone? If it is an iPhone 11 see→About recalibration of battery health reporting in iOS 14.5 - Apple Support (already posted on this page, but who ever reads a thread before posting?)

I got the same problem, I updated it now to version 14.3 but it did not fix anything. Later that day, I freed space to optimize my iPhone and the battery percentage came back to normal

The Apple Recommended solution here is missing the mark. This is NOT an actually battery draining issue. I see the same thing with the percentage dropping rapidly and then when the phone is rebooted the phone shows like 75% battery. This is clearly a battery monitoring software issue with iOS14 and above. I hope that someone at Apple is taking note of all the complaints and working toward a software bug fix.

I have the same issue, now on iOs 14.3. Battery down at a low % and when you reboot the phone it shows the real level. Just done that and jumped from 27% to 97% and it was fully charged an hours ago. Definitely a bug, only started happening to me following a iOS upgrade. At first I thought it was the usual background work the phone does following an upgrade chewing up the battery but it isn't. Also seems a but random. I first noticed it weeks ago, then it went away and has been fine for weeks but has just started happening again.

What does it say specifically under “Peak performance Capability”?

However, that symptom is a failing battery. There are several different failure modes to batteries. An Apple genius bar can run diagnostics.

I end up with replacing the battery. My problem is gone now, wonder for how long... Funny that my 1yo battery died exactly when I upgraded os. Coincidence?

Had the battery replaced by apple and problem solved.

Protect & Prolong life of your iPhone's Battery:

1. About the battery usage on your iPhone, iPad, and iPod touch ...
2. Batteries - Maximising Performance - Apple (IN)
3. iPhone Battery and Performance

Try some of these options too.

1. Avoid Screen Mirroring
2. Put on Low Power Mode
3. Put Auto Lock On (1 min):- with low power mode it will be 30 Sec
4. Put Auto Answer Off
5. Disable Push notifications for apps you do not use often
6. Keep your iPhone Face down to prevent notifications to light up screen
7. Enable Auto Brightness:- Settings > General > Accessibility > Display Accommodations > Auto-Brightness [Enable]
8. Manually lower brightness from Control Center
9. If you Want to watch continuous Video. Stream it on TV or a Monitor
10. Don't force close apps; Apps which are not on frontend screen are paused by the system to save energy. Apps require more energy to re-launch. Apps which are open in the background use large memory is a myth and quitting them is counterproductive
11. Location services to be allowed only while using the app
12. Set your iPhone to fetch email and calendar data from internet less frequently
13. Turning off Background App Refresh 
14. Charge before it drops below 20-30%
15. Try connecting to trusted Wifi where ever available in stead of Cellular
16. Enable Airplane mode in areas with bad cellular and wifi coverage. Your phone keeps trying for reconnection with the missing / weak network. This uses lot of energy
17. Switch off Wifi & Bluetooth while in Roaming or Not in Range
18. Enable "Wifi Assist" : Settings > Cellular or Settings > Mobile Data > Wi-Fi Assist [Enable]
19. Periodically Check your Battery Health (Settings > Battery > Battery Health)

I did factory reset as well - didn't help at all. Yesterday I turned off the Optimised Battery Charging and left the phone for the whole night plugged into the charger. Today battery indicator seems to be much stable... Also weird thing, optimised battery charging is being turned on automatically - I'm turning it off permanently and after some time it's on again. Anyone experiencing anything similar?

I have had this—definitely the battery meter is inaccurate or failing to update. I had a 1-hour call and the battery % only dropped 10% and that is simply not possible given the typical drain from a phone call.

It was reading 84% which simply wasn't possible, so I rebooted the phone to try to force it to update. It didn't change at all. I let it sit for a few minutes, then had another call. The service kept cutting out and I noticed it suddenly dropped from 84% to 44%, then another sharp drop to 25%. Then it stayed the same for the rest of the call, even though in reality it must have been getting close to 15% or even 10%.

I was on the phone with support a couple weeks ago explaining that I was seeing instantaneous drops of 50% or more and that clearly the battery indicator wasn't working. They stated it had to be a hardware issue, not software, but there was no explanation of why this issue didn't appear until iOS 14.

I have the same problem with a 6S which is 30 months old, it can still charge to 100%. when around 80% it can rapidly drop to nothing within minutes and go blank, when resetting with on and home buttons it can shoot back up to 80%. I have had support from apple who says the battery requires replacing which I have put in motion. I will post on this forum with the results.

I stand corrected.

QuickTimeKirk’s comment appeared to emphasize time in service and not other pertinent information such as maximum capacity. Note that 80% is a leftover from flooded lead acid technology and the battery chemistry used in cell phones does not have a knee at 80% of rated capacity but instead declines at a rather flat rate. But again the issue is apparently the battery meter algorithm which is hopefully a software issue that Apple will soon fix.