iOS 9.3.2 battery vs 9.3.1 battery

Wow, that's horrible.

--- Post Merged, Apr 14, 2016 ---

"iPhone has been plugged in since last full charge" though...

 

Been asleep on a red eye flight so most of the use came on the ground. Consistent 10% / 1h for me.

 

What phone?

 

Idk what to do

 

Getting horrible battery life too on my 5S running 9.3.1. Maxing around 4 hours of use, which is a joke. Background app refresh disabled and all.

 

Yeah I know. plugged it in for like 5-10% battery gain while I was driving somewhere.

 

I don't even know if a fresh copy is worth the headache. Might not even solve the issue

 

And you're on 9.3.1 so that's crazy that you're having these issues on a STABLE release. I'm on 9.3.2 beta and was considering downgrading but now like someone else just mentioned, I'm not even sure it's worth downgrading/installing fresh copy.

*sigh* I think I'll wait for 9.3.2 beta 2 and hopefully that fixes things.

 

Just do it. Stop being lazy. I do fresh installs every new version of iOS. I rarely/never restore from backup.

--- Post Merged, Apr 15, 2016 ---

Did you accidentally quote me? I don't have any battery issues lol.

 

Great approach. Give it time with no apps installed to see if you really have an issue or not.

 

I'll give updates

 

keep us posted.

 

Same for me, iPhone 6s plus, 9.3.1 but it has been the same in every 9.3 beta and even in 9.2
1 hour in use is 10% of battery with 35 - 40 hrs in stand by.

 

I first noticed my Watch having a very quick battery drain last week. I visited the genius bar - they restored the watch as new. It didn’t work - they kept the case open. At the same time my iPhone was also quickly draining battery. This all started at some point after 9.3 and/or 9.3.1 - I don’t know when nor the circumstances.

I looked at multiple forums - imore, macrumors, Apple communities, Apple developer, Reddit, etc. Some combination of events occur and a number (no idea how many) people run into this problem.

Background - we have two identical sets of iOS devices — one pair each - iPhone 6s+ and Watch . The exact same battery drain happens on all iOS devices - Watches and iPhones.

Here are some of the things I tried - not necessarily in this sequence.

• Started my watch and DID NOT power on the matching iPhone. Result - no battery loss in the Watch.
• Powered off the Watch - started the iPhone. Result - high battery drain on the iPhone.
• Conclusion - the watch drain happens only when paired with the iPhone - assumed the iPhone is where the issue lies.
• Assumed - this is not a bad battery - rather some anomalous software error.

• Loaded Xcode and instrumented, using Activity Monitor in instruments, the iPhone for about 30 minutes while locked and of course connected to the iMac.
  • There was very high CPU usage while locked and plugged in.
  • Two system task/daemons were taking a great deal of CPU cycles: mediaanalysisd and identityservicesd.
  • Researched both - I think (not sure) that the media analysis task is looking at Photos - and / or indexing. The Identity Services task seems to be associated with iCloud.
  • I assume there will be some system tasks that only execute when the phone is locked and has power- e.g., tasks associated with indexing, backing up, downloading apps, etc.
• Did additional searches for anything associated with iOS and identityservicesd - not limiting it to iOS 9.x.
  • I found a few posts that indicated success with one method - these posts seemed reasonable and well thought out.
  • They said they succeeded in stopping the battery drain by signing out of all services, restarting and signing back in.
  • This problem occurred under multiple iOS versions not just 9.x

• Here’s what I did:
  • Signed out of iCloud and iTunes - confirmed to IOS to remove all associated DB’s - Photos, Contacts, etc. from my device.
  • Rebooted the iPhone and signed back in to iCloud.
  • Let the DB’s restore while plugged in and on Wifi - took about three hours due to a large Photos DB.

• Results:
  • Took the iPhone off the charger - in standby mode with normal times running in the background (Mail, notifications, etc,) - after 5 hours - very little battery drain. Matching watch was not turned on.
  • Took the second IPhone off the charger at the same time. It maintained a very high battery drain during the same five hour period (maybe 5 to 6% hour) while in standby.
  • Next Day (Today) - 4 hour test - Added the Watch to the first iPhone - very low battery drain on Watch - maybe 1-2% hour - where it had been at least 5-6% hour.
  • The matching iPhone after 4 hours is still at 100% - and not using much background time relative to standby.
  • Unexpected results: The second iPhone - which had been rapidly losing battery last night against the first iPhone - today has identical results as the first iPhone - very little background usage. This iPhone was not signed out of iCloud as the first iPhone was.

• Bottom line: The process of signing out of all services, rebooting, and signing back in worked on my devices. Re-Instrumenting the iPhone for 30 minutes shows very little identityservicesd CPU time.

UPDATE: Battery life continues to be normal - no more unexpected draining after 8+ hours.

UPDATE II: If you look at the diagnostics log (Privacy | Diagnostics . . .) in your iPhone - you may see an entry similar to this: ExcResource_identityserviced-2016 . . . Apparently this gets recorded if there is excessive CPU usage on one the system tasks - look at the entry for it - if you have some of these they may be a sign of the battery drain. I logged out of all of iCloud - it's probably overkill - but, I don't know which 'account' (twitter, messages, iCloud, etc.) is really creating the issue.

I hope this helps someone - hopefully I made it fairly clear as to what I did.

 

Is there any app on the iPhone or program on Windows that would allow me to monitor my cpu usage?

 

Some "System Monitor" apps used to show what system tasks were running - but, it didn't show CPU activity - you need to use "Instruments" out of Xcode to determine that activity. The apps that used to show what was running can no longer - I believe - access that part of system memory - I could be wrong.

 

Xcode

 

Wrong thread

 

Oops never updated my sig last year. 6s Plus on VZW, 9.3.2

 

I would like to use Xcode to try and take a look at performance, can you tell me what to do? I just downloaded Xcode. Thank you

 

For Windows

 

iPhone 6S - 9.3.1

 

Interesting. Looking at what you experienced here, it's making me wonder if perhaps it was something to do with automatic iCloud backups that was causing all the drain for you. (I know you mentioned that you deleted most of your iCloud data, but wondering if perhaps the backup of the phone itself could have been playing a role in some way?) One way to perhaps try and narrow down if that was the culprit is to test the difference between what happens if the enable iCloud backups setting is on compared to when it is off. If you decide to try this, be sure to post your results, as at least we'd know for sure one way or another, even if it turned out not to be the case. (If it's that, then we'll have found it, but if it's not, then we'll know to try something else.)