iPhone 8 plus maximum capacity at 98% after two weeks of usage

Discussion in 'iPhone Tips, Help and Troubleshooting' started by Future-Proof, May 27, 2018.

  1. Future-Proof macrumors regular

    Future-Proof

    Joined:
    Apr 29, 2018
    #1
    Hi,

    My iPhone 8 plus maximum capacity is at 98% according to system: battery: battery health (beta) after just two weeks of usage.

    Is this normal??
     
  2. mattguy10 macrumors 6502a

    mattguy10

    Joined:
    Aug 18, 2010
    #2
    No that isn’t normal, but keep in mind that the battery health feature is beta and may not be 100% (no pun intended) accurate. Do you have a Mac? You can download a free program called Coconut Battery and see if that also shows 98%
     
  3. TiggrToo macrumors demi-goddess

    TiggrToo

    Joined:
    Aug 24, 2017
    Location:
    Out there...way out there
    #3
    Scary - my 1.5 year old iPhone 7 plus shows 99.3% full charge capacity and 94.2% of design capacity, with 256 cycles...
     
  4. C DM macrumors Sandy Bridge

    Joined:
    Oct 17, 2011
    #4
    Is that in iOS somewhere? And what is full charge vs design capacity?
     
  5. TiggrToo macrumors demi-goddess

    TiggrToo

    Joined:
    Aug 24, 2017
    Location:
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    #5
    Coconut Battery on my MacBook with my iPhone connected via the lightening port...

    I think the later is the theoretical max the battery was designed to be, the former is how much it was 'out the box'. Please note the phrase here 'I think'...
     
  6. C DM macrumors Sandy Bridge

    Joined:
    Oct 17, 2011
    #6
    What does iOS show (assuming you have 11.3 or later)?
     
  7. TiggrToo macrumors demi-goddess

    TiggrToo

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    #7
    Still on iOS 11.2.5 because I value my microphone more than I do an update!
     
  8. BigMcGuire Contributor

    BigMcGuire

    Joined:
    Jan 10, 2012
    Location:
    California
    #8
    I've had phones from the factory be anywhere from 96% - 106% of design capacity. Don't read anything into it. Don't think much of it - batteries don't wear consistently. I've taken monthly readings of my 6+, 6s+, and my 8 for years.

    My MacBook Pro 13' and my iPhone 8 are over design capacity from factory (lucky this time!). :)
     
  9. Future-Proof thread starter macrumors regular

    Future-Proof

    Joined:
    Apr 29, 2018
    #9
    I don’t have a mac but the other apps on the app store show 0% wear level - surely apple’s own battery health is more accurate? Some don’t show the exact total mAh’s correctly though ranging from 2700 to 2675. Should be 2691 right?

    Are you saying it’s the luck of the draw? If so i could return my iPhone and get a replacement because it’s still new...
     
  10. BigMcGuire Contributor

    BigMcGuire

    Joined:
    Jan 10, 2012
    Location:
    California
    #10
    Correct. Batteries are a chemistry. This is very difficult to get exact. This is why reading them is so difficult. Apple hides a lot of data from iOS too which is why a lot of users here use coconutBattery since MacOS can see that data. I honestly wouldn’t worry bout it too much.

    My 6s+ came from the factory with 96% design capacity. After almost two years and 230? cycles I traded it back to apple at 94-96%. It lost almost no capacity. My 6+ started at 106% and after two years lost 10%+ capacity. My 8+ is holding so far after 7 months at just a few % over design capacity.

    So even the wear rate can differ. I’ve had time to compare coconutBattery to Apple. Apple seems to read higher than coconutBattery.

    My Samsung Note 3 lost 40% of its capacity after half a year. But back then you’d just pop off the plastic back and buy a $9 replacement on Amazon. Apples batteries are amazing.
     
  11. mattguy10, May 28, 2018
    Last edited: May 28, 2018

    mattguy10 macrumors 6502a

    mattguy10

    Joined:
    Aug 18, 2010
    #11

    Yes you would think Apple’s battery health feature would be the most accurate, but like I said, it is in beta. If it’s something that is going to bother you, take your phone to Apple and see if they’ll exchange it. If they run diagnostics on your phone and all comes up ok, they probably won’t exchange it, but then at least you know you tried, and can just enjoy the phone after that. Honestly though, I’m sure the battery is fine.
     

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