How I solved my battery drain with iOS 9

Discussion in 'iOS 9' started by iBug2, Oct 28, 2015.

  1. iBug2 macrumors 68040

    Jun 12, 2005
    Ok this is going to be a funny story:

    So I installed iOS 9 with everyone else, and realized that it was draining my iPhone 6 battery quite a lot. I also use the watch so I thought maybe together with the watch, this drain was normal. But then I started seeing things like 60% battery lost overnight on standby, which didn't make any sense.

    So I restored my device and set up as new, as the last resort, 5 weeks ago.
    Didn't help. The same drain was there. So I thought, maybe it's a bug with iOS 9, so I made a bugreport and Apple told me to start logging my battery, which I've been doing for 3 weeks, and sending the logs to them.

    But last Friday, I had a minor foot injury and had to stay home for this whole week. Bored out of my frikking mind, I started playing with the phone and testing battery. I was restoring the device and not installing any apps and leaving the device on standby to see how much battery was draining. The battery was doing great without any apps.

    Then I installed apps and put in my music and made the phone usable again, and bam, battery started draining again.

    Then I thought about deleting my iTunes library and remaking it. I have around 60 GB's of music in my phone, so I thought maybe there's something wrong with the music files I'm putting in.

    I recreated the iTunes library, added all my music again, and restored the phone and set up as new device. Installed all the apps, synced music, and FINALLY battery back to normal with everything set up.

    So the problem I think was the iTunes library. Whenever I synced music to my phone, it would finish on the computer end, but it'd take some more time on the device for the sync icon to disappear. So I think the library file got corrupted at some point, and when syncing music to the phone, every time after setting up as new device or restoring from backup, some bad bits were being written to the phone.

    To be honest, I'm not surprised. Similar thing happened to me with my iPhone 4S many times. I'd sync music to the phone and the sync would just hang or stop in the middle, and only half the music would end up on the phone. Sometimes re-syncing would solve, sometimes it wouldn't so I had to restore from backup and try the sync one more time. And then I'd do the same trick, delete the library, remake it, and then the sync would go flawlessly.

    If you are dealing with huge iTunes libraries like mine (680 GB), things may get messed up every once in a while, which is a design flaw in the iTunes library structure for sure. Nevertheless, if your phone ends up draining more battery than usual, if you have lots of music in there, try this trick.

    And now off to reporting to Apple how I solved it. They should really fix that iTunes music sync.
  2. Mercenary macrumors 65816


    Sep 17, 2012
  3. iphonedude2008 macrumors 65816


    Nov 7, 2009
    Irvine, CA
    Thats cool. Very strange that that was the reason
  4. iBug2 thread starter macrumors 68040

    Jun 12, 2005
    Yes. I also realized that now my music app does not use any background process. Before I did this trick, whenever the music app was open, even if no music was playing, it would appear as using battery in the background the entire time whenever I checked the battery tab.
  5. Mickyuki Suspended


    Sep 28, 2015
    COOL~A reason that I'd never think of. Nice trick.
  6. Mlrollin91 macrumors G5


    Nov 20, 2008
    Ventura County
    Possible Spotlight was indexing all of the music? 60GB is a lot of information to index. Obviously it won't index for 5 weeks, but it could have definitely contributed for the first couple of day.
  7. iBug2 thread starter macrumors 68040

    Jun 12, 2005
    Nope, that's not it. I synced the same 60 GB music to the phone after doing the trick. If the issue was indexing, it would be indexing the same amount of files now but no more battery drain.
  8. Prabas macrumors 6502a


    Sep 14, 2010
    Ha, my battery is not great too. Apple Music is always on top with background usage. I'd understand it if I was using it for streaming music, but my music is available offline. 1 hour of playback - 10% lost.
  9. iBug2 thread starter macrumors 68040

    Jun 12, 2005
    Well, I'm not streaming any. All my music is offline and I'm not using the "Apple Music" service either. So there's no reason that my player app had background usage when no music is playing. And now it doesn't.
  10. uhaas macrumors 6502


    Aug 31, 2012
    Twin Cities, MN
    iOS 7 & 8 were horrible at corrupting the music databases. Glad you fixed it.

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