Battery Health

Discussion in 'iPhone' started by MarthaThany, Feb 7, 2019.

  1. MarthaThany macrumors newbie

    MarthaThany

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    Feb 6, 2019
  2. C DM macrumors Sandy Bridge

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    Oct 17, 2011
    #2
    It's still usable, but it's not that good, especially compared to being at 100% or even above 90%.
     
  3. NJHitmen macrumors regular

    NJHitmen

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    Oct 8, 2010
    #3
    No, that's not good at all. To be clear: the health percentage isn't a comprehensive assessment of the battery's condition - it's just one set of measurements. In other words, if two phones report a battery health of 85%, one may be usable while the other isn't. That said, most phones reporting 85% battery health will demonstrate significantly compromised performance.
     
  4. JPack macrumors 68040

    JPack

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    Mar 27, 2017
  5. FeliApple macrumors 65816

    FeliApple

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    Apr 8, 2015
    #5
    More than battery health, I'd look into battery life. My iPhone 5c has 83% health and its battery life is awful, but it was updated to iOS 9.
    On the other hand, my iPhone 6s is on iOS 9 with 91% health; I would probably say I should see some kind of reduced battery life. It lasts exactly the same it did when new.
     
  6. now i see it macrumors 68030

    Joined:
    Jan 2, 2002
    #6
    If the battery isn't lasting long enough for you between charges, then it isn't "good enough". If it lasts long enough to not be a hassle to charge it, then it's fine - for you.

    Someone could have an old iPhone battery with only 60% capacity remaining, but if it lasts long enough for their use before they need to recharge it, then the battery is fine enough- for them.

    Even a brand new battery doesn't last very long if you use the phone non-stop constantly.
     
  7. BasicGreatGuy Contributor

    BasicGreatGuy

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    Sep 21, 2012
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    In the middle of several books.
  8. Knight3 macrumors regular

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    Oct 19, 2018
    #8
    I’m trying to make sense of this.
    How could a phone or any device for that matter perform perfectly regardless of battery deterioration? Provided every other variable has stayed the same.

    Genuinely confused and curious as to what might’ve changed.
     
  9. yukari macrumors 6502

    yukari

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    Jun 29, 2010
    #9
    Battery health is a misnomer. I would rely on whether you need to charge more often than you would like.
     
  10. joeblow7777 macrumors 603

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    Sep 7, 2010
    #10
    It's better than 84% but not as good as 86%.

    Seriously, only you can decide if your battery is performing well enough for you or not.
     
  11. mrex macrumors 68030

    mrex

    Joined:
    Jul 16, 2014
    Location:
    europe
    #11
    I think 85% is fine - depending on the cycles/ battery life and the whole condition of course... mine was 82% before i got it replaced, but the reason was not that but my phone sometimes went off when there was still 40% left. the phone wasnt reliable. The battery was original (6S+, 3yo battery) and maybe a bit faulty too... cost me 39euros and now the phone works fine again when the charge goes below 40%...
     
  12. xxray macrumors 6502a

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    Jul 27, 2013
    #12
    It’s not good, but I’d probably try to make it last till it gets under 80%.
     
  13. FeliApple macrumors 65816

    FeliApple

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    Apr 8, 2015
    #13
    Honestly, I have no idea why. I have seen a slight degradation on my iPad Pro 9.7 with 93% health running iOS 9 (slight meaning from an average of 14 hours to barely scraping 13). I would have expected similar degradation in battery life on my iPhone but it hasn't happened.
    Other variables remain unchanged (every single setting has been steady since I first set it up; app usage has more or less remained constant). Why haven't I seen any kind of degradation is a mystery.
     
  14. srsub3 macrumors 6502

    srsub3

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    Mar 10, 2013
    Location:
    NYC
    #14
    I guess they introduced another killer switch, more subtle than the other. Before last two updates, my battery health was 93%. It depleted to 88 in less than a month. Phone is slower... The first thing I noticed is that you should press lateral button for a long time to boot the phone, let's say 5-6 seconds. I can clearly remember that it took 1 fast 1 second long push before. iPhone 8, one year old.... by chance we are in the same period the battery gate came out last year....
     
  15. C DM macrumors Sandy Bridge

    Joined:
    Oct 17, 2011
    #15
    The side button should take a longer to boot up the phone to avoid accidental boot ups. Doesn't have to do anything with the battery or some "killer switch".
     
  16. srsub3 macrumors 6502

    srsub3

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    Mar 10, 2013
    Location:
    NYC
    #16
    And then why it depleted of 5% in a month?
     
  17. C DM macrumors Sandy Bridge

    Joined:
    Oct 17, 2011
    #17
    Because it's an estimate that can change and is based on variety of factors including some chemical readings? Because the battery can in fact age at different rates at different times under different circumstances?
     
  18. brent12 macrumors member

    Joined:
    Jun 24, 2013
    #18
    When an iPhone is indicating battery at say 83%, it is still (in general) providing the same voltage as a battery at 100% but it will not be able to do so for as long. So your phone should perform about the same unless Apple for instance throttles the hardware so it drains the battery more slowly by running the phones hardware (CPU, etc.) more slowly.
     
  19. JPack macrumors 68040

    JPack

    Joined:
    Mar 27, 2017
    #19
    When battery capacity decreases to 83%, battery impedance increases due to age. Impedance affects the battery's ability to deliver peak power.

    Apple didn't throttle phones to increase runtime, they did so to avoid unexpected shutdowns associated with increased battery impedance.

    A battery at 83% isn't able to deliver the same peak power as a new battery. That's why Apple limits burst activities like speaker volume, camera flash, and processor frequency during the throttled state.
     
  20. Knight3 macrumors regular

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    Oct 19, 2018
    #20
    I don’t think that’s what it means.
     

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