Weird battery level graph

Discussion in 'iOS 12' started by zorinlynx, Jan 5, 2019.

  1. zorinlynx macrumors 603

    zorinlynx

    Joined:
    May 31, 2007
    Location:
    Florida, USA
    #1
    My mom was complaining that her phone battery was lower than it should be, and when I checked the graph I saw this. It looks like the battery suddenly jumped from just over 50% to around 25% around midnight for no apparent reason, and stayed exactly there for many hours. She didn't use her phone around that time at all.

    Is this a sign that the battery is failing, or just a bug in iOS? Anyone else seen this before?

    It's a slightly over four year old iPhone 6.

    IMG_0067.PNG
     
  2. Blue Hawk macrumors regular

    Joined:
    Dec 18, 2017
    Location:
    Germany
    #2
    This only happens when the battery health isn’t good anymore I think.
     
  3. aakshey macrumors 65816

    aakshey

    Joined:
    Jun 13, 2016
  4. zorinlynx thread starter macrumors 603

    zorinlynx

    Joined:
    May 31, 2007
    Location:
    Florida, USA
    #4
    Ugh, that'd be pretty bad timing since the $29 replacements are no more.

    Though her phone is working fine at the moment. She's a pretty light user.
     
  5. C DM macrumors Sandy Bridge

    Joined:
    Oct 17, 2011
    #5
    I think they are at $49 now, which isn't too bad.
     
  6. aakshey macrumors 65816

    aakshey

    Joined:
    Jun 13, 2016
    #6
    But they won't replace unless the graph shows 79% or lower.
     
  7. C DM macrumors Sandy Bridge

    Joined:
    Oct 17, 2011
    #7
    Potentially. Hard to say how strong of a comeback that part of it all has made at this point.
     
  8. Blue Hawk macrumors regular

    Joined:
    Dec 18, 2017
    Location:
    Germany
    #8
    They do. My dads iPhone showed 98% which was wrong. And they have changed it a year later for free.
     
  9. k0bayashi macrumors member

    Joined:
    Jan 6, 2019
  10. aakshey macrumors 65816

    aakshey

    Joined:
    Jun 13, 2016
    #10
    They only did from 1st Jan 2018 to 31st Dec 2018.
     
  11. now i see it macrumors 68030

    Joined:
    Jan 2, 2002
    #11
    It's not battery failure, it's the "digital battery level gauge" out of calibration.

    Run the phone down until it almost shuts off, then charge it all the way back up to 100% without using it - use the standard slow/tiny apple charger. Not a fast charger.

    Do that again one more time and the battery level meter should re-calibrate.
    But don't make it a habit of running the battery down that low in the future. It's hard on it.
     
  12. luismedina macrumors member

    luismedina

    Joined:
    Aug 31, 2017
    Location:
    Monterrey, Mexico
    #12
    I had the same during new year hoildays, I was in a place completely out of cell signal, phone in airplane mode all the time, and it went from 80% to 65% overnight, showing the same gap in the graph, my battery health is currently at 92%
     
  13. doxielover macrumors 6502a

    doxielover

    Joined:
    Apr 12, 2011
    Location:
    CA
    #13
    I almost always have my 6s plus on low power mode does this mess up the calibration? How come most websites say when you calibrate use the battery until the phone shuts off.
     
  14. chekz0414 macrumors 6502a

    chekz0414

    Joined:
    Jul 3, 2011
    Location:
    FL
    #14
    No, they’ll replace the battery as per customer request even if it’s not 79% for $49 or $69 which is the out of warranty cost.
     
  15. C DM macrumors Sandy Bridge

    Joined:
    Oct 17, 2011
    #15
    Now that the replacement program from last year is over, they haven't gone back to the established requirements for replacement?
     

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