iPhone X Maximum Battery Capacity dropped 2% in 3 weeks, how?

Discussion in 'iPhone' started by MK25toLife, Oct 10, 2018.

  1. MK25toLife macrumors regular

    Aug 7, 2007
    Hello, I bought a like new iPhone X on Sept. 18th and the Maximum Capacity at the time was 100%. Today, I checked it and it was at 98%. My avg. screen on time is 5hrs 51mins a day and avg. screen off is 1hr 3mins. It's quite hard to believe my screen is on almost 6 hours a day. I work full time and while I do check it quite often I have a hard time seeing how it adds up to 6 hours a day.

    Any thoughts? Is my avg. screen on time in the 99th percentile or something? Is that why my battery capacity dropped so quickly?
  2. AppleHaterLover macrumors 68000

    Jun 15, 2018
    I'm quite addicted to my phone as well.

    Here's some factors for you to consider:

    1) Battery degradation is not linear
    2) Battery Health is in beta
    3) If you're not seeing any strange behavior or reduced battery life, you should be fine.

    I got my phone in February, with very heavy usage the battery is now at 90% (and it dropped from 92% to 90% int he past two weeks or so). Sad but welcome to real life, batteries are consumables. If/when battery life becomes an issue, replace the battery.
  3. Freakonomics101 macrumors 68000


    Nov 6, 2014
    According to iOS 12, battery health is no longer in beta.
  4. menist macrumors 6502


    Jun 10, 2010
    I had a iPhone 7 that was like that, was at 100% then quickly drop to 98. It stayed at 98% for a year.
  5. SoYoung macrumors 6502a

    Jul 3, 2015
    My iPhone 6s plus quickly degrade to 90% capacity and after 2 years and a half, battery capacity is at 84%. It will be stable at some point. The phones are made to hold 80% capacity after 2 years at least,
  6. smirking macrumors 68020


    Aug 31, 2003
    Silicon Valley
    Batteries will do that. Battery health is just an estimate. I doesn't matter if it's beta or not. When it was saying 100%, it might not have actually been at 100% just as it might not actually be 98% right now.

    I don't pay attention to my iPhone battery as much so I'll use my 2016 MBP as an example.

    1-25-17: 102% (first reading)
    6-14-17: 100%
    10-13-17: 96%
    11-29-17: 93%
    12-21-17: 95%
    5-7-18: 90%
    9-9-18: 82%
    right now: 86%

    I don't know how the iPhone's battery app is calibrated, but Coconut Battery actually shows my MBP gaining battery life after it lost some of it. I doubt that actually happened. It's just coming up with different estimates. I'd only worry if your percentage drops fast and keeps dropping for weeks and months without stabilizing or you start having performance issues related to power.
  7. Renho macrumors 68000


    Sep 15, 2014
    SR, CA
    I think battery health is out of beta now
  8. smirking macrumors 68020


    Aug 31, 2003
    Silicon Valley
    I always tell people not to freak out about their battery, but what you described would have freaked me out. I've had a number of battery related issues (all with laptops) before. Batteries are just not entirely predictable. You can get ones that steadily decay and keep decaying slowly and others that seem to retain their health for an impossibly long time only to become entirely unstable and unusable.

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7 October 10, 2018