Iphone 11 pro battery percentages jumping around (iOS 15.2 - 15.2.1)

iwnlden wrote:

it really is bothering me, does it means I got a faulty devices? shouldn't i get a free replacement for this? because clearly its not my fault, because the battery itself still doing well, its just the percentages jumping around like this

Most likely there's some issue with the battery or possibly the onboard diagnostic electronics on the battery. There's a little board on the battery that does things like monitor the state of the battery and has a small amount of memory to store data like the reported battery health. If a battery is transferred to another iPhone, the battery health and all that other stuff logged on the diagnostics electronics will transfer with the battery. The photos you showed indicate odd behaviors, including the reported charge level increasing without being charged, and sudden drops in the reported charge level.

There have been some recommendations to "recalibrate" the battery (really update the onboard battery diagnostic monitor) even though Apple hasn't recommended it in years. It was something that Apple used to recommend be done at least once a month for some Apple battery powered devices (like notebook computers that mostly sit on a desk), where a device is powered only from the battery starting at 100% until it shuts down by itself. The idea was that it monitors the amount of energy that's being used, and when it hits the voltage at which it's designed to shut down, the power management system will have a better idea of how much full capacity the battery really has and will update the battery health. Also - battery health is only an estimate, and when it's way off that's when strange things can happen.

However, I'm pretty sure that just replacing the battery is going to solve your problem.

Agreed. That symptom usually means a battery that is failing for reasons other than loss of capacity, such as high internal resistance.

That's unusual. I've only seen battery charge level jumping like that with a severely degraded battery where it seemed that the power management system couldn't figure it out.

If it really bothers you, you should be able to request a battery replacement service for the normal out of warranty fee. Unless it's worn or a diagnostic uncovers a specific fault, I don't believe the warranty (which has expired if you've had it for two years) or AppleCare+ (if still active) would cover a replacement.

Hello,

These are the standard steps:

1) Have you tried a restart?  If not, do it now.

2) Go to Settings > Battery > BATTERY USAGE BY APP to see the apps that are consuming your battery.

3) Check “Battery Health” in the link: iPhone Battery and Performance

4) Charging tips: When to charge your iPhone or iPad

5) If all else fails, consider a battery replacement:

iPhone Battery & Power Repair

Good luck.

iwnlden wrote:

the battery drops to 87 for a long time and then suddenly it rises up to 100% and then things pretty much goes to normal and then suddenly its stuck at 67% and then drip down to 45% in sudden 🥺

It could be worse. I had a MacBook battery that was reporting negative capacity.

But at this point I guess it's pretty obvious your battery needs to be replaced. Good luck.

i have the same issue.

i have my ip11 since august and the battery health is about 97%. since the ios 15 was released, the battery is dumb. they’ve scanned my phone through the apple support app and didn’t found anything wrong with the battery.

dunno what is happening, but hoping that’ll be fixed.

I was wrong, and I apologize, It appears that the phone was not being charged at the time. So that is similar to the earlier posts; if battery state of charge varies with load that usually indicates a battery with high internal resistance, which the built-in diagnostics aren’t good at detecting except at low charge levels.

iwnlden wrote:

huh? normal?? look at that sudden spike

That is not a “sudden spike”. The phone paused charging around 9 pm, resumed around 1 am, reached 100% a short time later and stopped charging. It then started discharging.

That looks perfectly normal for a phone that is charged overnight with optimized charging turned on.