How much does battery health decline?

Discussion in 'iPhone' started by andymac2210, Jan 31, 2012.

  1. andymac2210 macrumors regular

    Jul 18, 2011
    After 60 charge cycles on my 2010 macbook pro the battery healthy is at a fairly decent 90% according to istat pro.
    Not a big deal since it can be plugged in most of the time anyway.
    But a phone is quite different, a phone spends 95%(or more) of it's life on the move, not charging.

    Would this be similar to the iPhones battery?
    If so, you'd be looking at a 10% degradation in 2 months assuming 1 charge a day.
    That's 30% in 6 months and 60% in 1 year!
  2. /user/me macrumors 6502

    Feb 28, 2011
    Your battery will be fine. Istat is pretty accurate, but not 100%. I had my 4 for almost 2 years now with virtually no noticeable drop in battery life.
  3. miles01110 macrumors Core


    Jul 24, 2006
    The Ivory Tower (I'm not coming down)
    Battery decline isn't linear anyways. Stop worrying about your battery and just use your iPhone/Macbook Pro how you want to. You're wasting your time fussing about things that can be easily and cheaply replaced.
  4. mrsir2009 macrumors 604


    Sep 17, 2009
    Melbourne, Australia
    The iPhones battery is pretty much the same type as any other on the cellphone market... And none of my cellphones have ever had a significant decrease in battery life.
  5. andymac2210 thread starter macrumors regular

    Jul 18, 2011
    So are you saying the battery decline may be slower than that of the macbook pro's battery?
  6. Kyotoma macrumors 68000


    Nov 11, 2010
    Carnegie and Ontario
    Not necessarily. We are simply advising you to not worry about it.
  7. Small White Car macrumors G4

    Small White Car

    Aug 29, 2006
    Washington DC
    I think that after 5 years of iPhones, it'd be pretty common knowledge by now if this were true.

    It's far more likely that this isn't the case than it being true and everyone hiding it somehow.
  8. TG1 macrumors 6502a


    Feb 21, 2011
    19 months on my iPhone 4 and still going strong. I don't think I've even lost 10% of capacity. Use about 1 gb of cellular data per month and lots more over wifi. Charge almost once a day.
  9. Interstella5555 macrumors 603


    Jun 30, 2008

    you should check your math
  10. kadentrom macrumors newbie

    Feb 2, 2012
    Depending upon the individual there may be an increase in irritability and perhaps some trouble staying focused, but overall, the body and the mind still function as long as the sleep deprivation doesn't continue.
  11. EmbraceTheOne macrumors 6502a

    Aug 26, 2011
    I honestly wouldn't worry about it that much.

    2011 Macbook Pro, Purchased Late June. 262 Charge Cycles, 94% health.
  12. jamewhite86, Feb 3, 2012
    Last edited: Feb 13, 2012

    jamewhite86 macrumors newbie

    Feb 3, 2012
    How much does battery health decline?

    I dont plug in my power adapter when i come back from my friends and the battery will run out. the last two times the health has dropped dramatically. thanks for lot of information.
  13. lordofthereef macrumors G5


    Nov 29, 2011
    Boston, MA
    Just think about what you are implying. I assume you have an iPhone. Have you experienced this over the course of a year? No? We;ll then, you answered your own question.

    Going a bit deeper, where are you getting these numbers. Based on the degradation level that a piece of third party software told you about your one device you tested? That is hardly going to be a statistically relevant number when trying to look at things as a whole. I am sure there are threads, tests, etc. about this. Did you search? Not trying to be rude, but the forums seem to be teaming with questions like this.

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