Low Power Mode doesn't work

Discussion in 'iOS 9' started by paulking, Sep 19, 2015.

  1. paulking macrumors member

    Aug 7, 2010
    My iPhone 6 running iOS 9 was at 20% power last night. Got the expected notification and hit the new option to go to low power mode.
    Apple says battery life will be extended up to 3 hours in this mode at that point.
    I got @ 40 minutes till the phone went to zero battery and powered off.
    Which isn't even normal in regular mode for what I was doing.
    Reading on safari with minimal surfing on my home wifi network.
    (Note: I routinely keep all settings like mail push, background updates, and GPS off for best battery life)
    Anybody have experience to share?
  2. C DM macrumors Westmere

    Oct 17, 2011
    I believe it was up to 1 hour, and that still depends on your environment and what you are doing of course.
  3. DoctorFedora macrumors regular

    Jun 8, 2010
    Up to three extra hours ON A FULL CHARGE. It works just fine for that.
  4. paulking thread starter macrumors member

    Aug 7, 2010
    From "Apple Insider" article which is referencing official Apple documentation-
    "Apple is in fact promising that simply installing iOS 9 should give an iPhone 6 an extra hour of battery life. Turning on Low Power should add another three hours."
  5. paulking thread starter macrumors member

    Aug 7, 2010
    I think that's probably the important distinction - but if one is prompted to go to low power mode at 20% battery, you would think it would do better than the 40 minutes I got. I mean that's no savings considering the use conditions I described in my original post.
  6. aristobrat macrumors G5

    Oct 14, 2005
    IMO, low power mode shuts down what it says it's going to shut down.

    It's not magic, though.

    If an iPhone is blazing thru battery because it's in a low cell coverage area, or has a 'high CPU using' app running errantly in the background, it's not going to help much.
  7. T'hain Esh Kelch macrumors 601

    T'hain Esh Kelch

    Aug 5, 2001
    Yes, 3 hours from a full battery. You don't magically get 3 hours more by turning on that feature, when you have 0,0001% battery left.
  8. ohio.emt macrumors 6502a

    Jul 18, 2008
    If you have never turned on must of the functions it turns off it won't be that dramatic of a change.
  9. C DM macrumors Westmere

    Oct 17, 2011
    I don't believe that's from 20%.
  10. Pelea macrumors 6502

    Oct 5, 2014
    low power mode didn't work as well as they said it would, that shouldn't be surprising.. just look at everythingapplepro's comparison on youtube, ios 9 made all iphones slower in terms of app switching/opening and general usage (besides some exceptions such as wifi) even though apple promised a "1.4x improvement".

    ios 9 simply didn't live up to apple's standards.. just wait till ios 10
  11. C DM macrumors Westmere

    Oct 17, 2011
    All phones? And yeah, the reality is that it's more or less on par of what a x.0 release is like. Hopefully various things will improve with additional updates, as they have in previous versions.
  12. paulking thread starter macrumors member

    Aug 7, 2010
    None of those conditions apply in this case. Cell coverage is excellent. No apps running but safari.
    The new OS invites us to go to low power at 20% and in my case it did nothing to extend the battery.
  13. C DM macrumors Westmere

    Oct 17, 2011
    Well, could the battery have depleted even faster if you didn't enable it? As for when the prompt for it comes up, that's a hint that Apple put when the power gets low, but if someone wants to enable it at some other point themselves they certainly can.
  14. east85 macrumors 65816


    Jun 24, 2010
    Maybe go into Settings > General > Reset all Settings and see if that solves the problem.
  15. Pelea macrumors 6502

    Oct 5, 2014
    the iphone 6 was the only one which wasn't handicapped, its speed stayed more or less the same
  16. paulking thread starter macrumors member

    Aug 7, 2010
    My original post is in error.
    Assuming that the phone would get 3 hours more with low power mode when it was at 20% battery was incorrect on my part. But my notion that there should be some noticeable savings at that point seems correct. Otherwise why have this feature option in the 20% battery notification. That's a significant thing for Apple to build into user experience.
    It's like throwing us a life preserver.
    It darn well better have an effect on the battery life!
  17. C DM macrumors Westmere

    Oct 17, 2011
    Well, it appears that you didn't experience noticeable based on your one use of it. Perhaps you might notice it in some future uses? The savings can differ certainly, and based on different threads and reviews there are definitely people who notice them.
  18. willmtaylor macrumors G3


    Oct 31, 2009
    A Natural State
  19. KALLT macrumors 601

    Sep 23, 2008
    This is true. Low-power mode will only turn off many background processes (email and data fetching, background app refresh) and throttle your processor so that you phone doesn’t waste energy while it is in your pocket. It does almost nothing for active usage. As I said in another thread, those who use their iPhone sporadically throughout the day for light usage will benefit the most from this. If you turn your phone on very frequently and use processor-intensive apps, you will not notice much of a difference. When your phone reaches 20%, low-power mode will just make sure that your phone survives for an additional few hours or so, so that you can put it in your pocket and be assured that no background process is going to drain it.
  20. Tootall67 macrumors member


    Sep 25, 2014

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