iPhone battery meter accuracy?

Discussion in 'iPhone' started by Faize, Feb 15, 2014.

  1. Faize macrumors member

    Joined:
    Sep 23, 2011
    #1
    Is the iPhone's battery meter intended to be accurate? Or is it like a car's gas meter? My iPhone went from around 17% at noon to 1% at around 3 PM, and then stayed at 1% until 7 PM when it finally turned itself off...
     
  2. Tyler23 macrumors 603

    Tyler23

    Joined:
    Dec 2, 2010
    Location:
    Atlanta, GA
    #2
    It's an estimate, not 100% accurate. It's meant to be close enough to be informative. In your case, I'd run the battery all the way out, then charge all the way up to help calibrate.
     
  3. C DM macrumors Westmere

    Joined:
    Oct 17, 2011
    #3
    It's based on voltage for the most part and that can fluctuate. But it's designed to be fairly good and not really jump around under most/normal circumstances.
     
  4. carjakester macrumors 68020

    carjakester

    Joined:
    Oct 21, 2013
    Location:
    Midwest
    #4
    according to my battery life app the status bar is 5% off right now
     
  5. C DM macrumors Westmere

    Joined:
    Oct 17, 2011
    #5
    I've seen some battery apps round battery to the nearest 5% or so when reporting. It's still a question which one is the right one too.
     
  6. cynics macrumors G3

    Joined:
    Jan 8, 2012
    #6
    Battery gauges are a mixture of art and science. There is prediction involved so it will never be 100% accurate. Usually you'll find 100% and 1% last the longest with everything in between being a crap shoot.

    Letting it drain completely will increase the gauges accuracy but only if you use it normally until it shuts off. For example running Netflix at max brightness until the battery dies can actually make it more inaccurate.
     

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