iPhone battery meter accuracy?

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

  1. Faize macrumors member

    Sep 23, 2011
    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


    Dec 2, 2010
    Atlanta, GA
    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 Sandy Bridge

    Oct 17, 2011
    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


    Oct 21, 2013
    according to my battery life app the status bar is 5% off right now
  5. C DM macrumors Sandy Bridge

    Oct 17, 2011
    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 G4

    Jan 8, 2012
    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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