iOS 13.5.1 battery drain

I did a little bit more tests today. And I found that iOS does not really suspend the app while it's in the background state anymore. Here's how I test it.

while(true){

napLock.wait(timeout: .now() + napDelay)

looperLog.i("running")

}

It's running on a worker thread. When the app is in the background state, the iOS will suspend all activities of this app before iOS 13.5. So there should be no more logs in the console. But after several switching between the foreground state and background state, iOS stops moving this app to the suspended state, so the app keeps running in the background. I think that's why there are so many apps showing a long running background activities in the battery usage page. Because all the apps are in background state rather than suspended state, so the system sees them as running in the background. I haven't migrated to the new UIScreenDelegate, so I'm still using AppDelegate to manage window and transitions. If there's some new features about it, shouldn't be applied to my app. This kind of thing changed the whole lifecycle, but there's nothing about it in the release notes.

I think that's the reason why iOS 13.5.1 is draining battery so fast. Because all the apps are permitted to running in the background without a limitation of time.

POSSIBLE EASY FIX!!!

Hi all, i had this same issue after 13.5.1 update, battery was just draining so fast, tried different setting suggestions, but last night i thought since the update i hadn't turned my phone completely off and back on again, so i did, charged the phone last night and just woke up to 100% battery, try totally shutting down your phone people, this worked for me... :-)

I solved my problem by completely restoring my iPhone 11 Pro (no backup).

At 16.30 pm I used to be at 20% battery with iOS 13.5.1 before resetting and today after resetting I'm at 75% at the same time of the day.

Hope this help.

Going strong. I’m attaching screen shots. So when you do 3 day obviously it’s an aggregate of of the last three days. First day Siri was doing that thing and was at 50-60% usage. But as you can see now. It’s settled down after the settings which I outlined in previous post.

I had to send my old phone back as part of exchange so I’m not sure how it’s doing but I do know it was doing similar after a reset. I’m pretty confident in saying a “Reset all settings” worked for me. But I’d recommend doing a erase all data and manually restoring. Do not restore data from iCloud or Mac backup. It was not as bad as I thought. And yes. It totally stinks that I would have to even do that. But it worked. I’m convinced it was 13.5.1 that didn’t play nice since we are all having the same problem. Not sure why a reset worked but it did.

bdautotech, Good to hear. Hope it helps others.

Remember the advice included completely reverting to factory settings and not restore, because the app or setting that may be causing the over-usage may be restored too, in your case the screen sharing.

Yes I know it does not work for every case but yours is yet another case of a bad setting or app causing the problem.

Apple has replaced my 4 month old iPhone 11 Pro. Note, they did not pickup any hardware or battery issues. After many hours of troubleshooting and diagnostics they advised they will need to replace the device even when they couldnt find an issues. I showed them the screenshots of the massive battery drain when the battery hit 55%, would drop to the 20%'s in 5 minutes. Would not charge past 93% with battery optimisation turned off. I restored and DFU mode restored iOS 13.5.1 multiple times as well as setup as a new phone twice without restoring from iCloud backup. I even calibrated the battery and nothing sorted the issue. This only started the day after upgrading to 13.5.1 from 13.4.1.

My problems are all gone, 9 hours on battery and i'm on 85%!!!! Woohoo, this is the battery life I was used to on the iPhone 11 Pro until the upgrade.

I'm so going to upgrade my Apple Care to extend to 3 years. Imagine if my device was on it's 13th month :(

I did the same thing with my iPad Pro 2017 which I never gave a factory restore before.

Battery life became indeed back to normal, BUT some apps who randomly runs in the background keep doing that. That also costs battery life.

Bullwinkle, Don't quote me from 24 pages ago and accuse me of demeaning people I am trying to help.

The only positive fixes coming out of these 25 pages that worked are:

• Restore to Factory or
• Restore from backup or
• Delete the offending apps or
• Reset or modify settings, Siri, Dark mode etc.

No other remedies have worked

What do you suggest??

Begging Apple for a "fix" and threatening to go Android certainly havent worked do far.

Here is my 2 cents. I had a very similar issue on both my iPhone and iPad, connected with the same account. All started two days ago and I had updated with 13.5.1 since the release date. By looking at battery activity, I saw that the Music App was very greedy on background, Reducing background sync or localisation did not have very much impact. And then I remember that I received a Shared playlist that I merged with my playlists. I removed this playlist and now, everything is ok. It seems that for’Music App, the sharing feature tries to load something forever and leads to an heavy background activity. Waiting for 13.6...

Yes I understand. But as you would clearly know you can choose each hour and see what app is used per hour. I left it for an hour after it was deleted to check. In the next hour period "after" the app was deleted ... and in the "next" new hour period, it still showed that message. This appeared to me that it was still running. Due to this fact, and regardless of whether I assumed rightly or wrongly, this led me to assume the app has probably had a bit of a malfunction and is why I actually re-installed. I wasn't going to re-install but I'm glad I did as it solved my version of this battery dilemma.

I have an iPhone SE 2nd gen and had this problem with the music app, battery drained badly even when I was asleep and not using the phone. As of writing this it appears I fixed the problem by

1. turning off mobile data use for music streaming
2. turning off background refresh for the music app
3. turn off automatic downloads for new music
4. turn off and back on the phone when I made these changes.

Will update if this changes.

Unfortunately, disabling background activity like you did does not seem to work for the few people who do have this problem.

Removing apps or completely restoring the phone as new have a far better chance of fixing whatever is troubling your 6S. Just install your must-have apps rather than restoring all the bad stuff from backup - for now at least.

A follow-up on this: I signed out of iCloud and the phone is no longer quick to get hot and drain the battery so quickly. Some apps still drain battery with usage, but it is not as bad and it is manageable. Time will tell how well this works with the essential apps I am running. This is still an issue with 13.5.1, and based on other forums, pervasive for this version regardless of hardware. Still needs attention from Apple, not just a problem us users have to solve.

Solution! For my XS on 13.4.1, i disabled background app refresh for Apple Music and also disabled cellular service for Apple music. I hypothesize that its actually the background refresh and will turn cellular back on tomorrow For Apple Music. BUT SIGNIFICANT difference in battery life!! I made the switch at 1300(EST) when my battery was at 20%. Since doing that, my battery is still showing 20% at 2035(EST). In the past 5 days, after hitting 20%, my battery would have lost charge after another 15 minutes. Will report back tomorrow about the effects of turning cellular back on for apple music.

The issue seems to be one related to iCloud. I have seen battery drain on an iPhone, iPad and Mac. my wife has seen none on her three. I use iCloud, she doesn't. Having turned it off the problem seems to go away.

After a month of issues for users Apple it is time for a fix please.