iOS 16.3.1 Battery Drain on iPhone

If your battery seems to run down quickly or the phone runs hot this user tip contains a number of ideas  

The last update killed my battery! - Apple Community 

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When to charge battery – read this User Tip by Lawrence Finch for great advice  When to charge your iPhone or iPad - Apple Community 

"...So, the only cause-effect available for me - is that draining is stopped after three cycles of a full discharge..."

That proves it was not the content of the update else you would still have the problem.

It does suggest a sick battery.

Check your iPhone battery for Self-Discha… - Apple Community

Draining the battery to "recalibrate" it has been deprecated since iphone 7, but it does suggest you need a new battery. What is the "Battery health" percentsge?

If it is 80% or above they may not replace it even for money.

So, for me, it is already a week, since the iPhone stopped eating out the battery! I am happy again))

What could fixed it?

1. some application got an update. Though I doubt it because I would see that this is some app that drains the battery. Also, on other phones with a similar setup but another version - were no problems.

2. Apple remotely fixed something, and published some quiet update?

3. Basing on your suggestion, I also made three cycles of full charge and full discharge (until iPhone turns off). So, maybe it was a coincidence, or, this is - what helped.

I tried everything, including reinstalling other firmware versions. I am not even saying about uninstalling apps, tuning settings, etc.

It would be very easy to rule out this update from causes if... I just could make a rollback to a previous version! But I cannot. Because Apple closes the ability to provide some signing process for previous versions. And that's it. The key problem - with this. We CANNOT rule out the update from the causes.

Yes, it is about 16.3.

I tried everything and the only thing I CANNOT try is to downgrade to 12.x, where there was no problem.

I even tried to update to a version, that I cannot mention because this message will be deleted.

This story would be much simpler, if there were messages like "I tried to roll back to 12.x and it didn't help, seems like it is about something else, let's compare our installed apps list". For example.

So, the only cause-effect available for me - is that draining is stopped after three cycles of a full discharge.

1. So, it is iPhone 13, 92% battery, there are two days passed after the last full discharge cycle.

2. The one night battery level graph shows discharge with 20 degrees inclination.

3. The exact next night - it shows a plain horizontal line.

Doesn't look to me like a sick battery.

Of course, you are wasting our time if you are not trying to follow the context.

And context is: my iPhone STOPPED draining the battery one night as it was pointed out earlier.

What can I test since then? Rhetorical question.

1. Quite likely
2. Nope
3. Dangerous, and pointless for iphone 7 and later

Which update? This is about 16.3

In 99% of cases you can rule out the update. in the other 1% Apple released a patch iosx.x.1 to fix it.

You should be on 16.4.1(a)

If you have a live usage line overnight tgen you are not doing the test which should be off charge and powered down

I didn't try to do any tests. I just described the sequence of facts that conclude it has nothing to do with battery sickness.

jorghen wrote:

I didn't try to do any tests.

So I'm wasting my time. Bye.