Full discharge on 7+ battery?

Discussion in 'iPhone' started by Septembersrain, Feb 4, 2017.

  1. Septembersrain Contributor

    Septembersrain

    Joined:
    Dec 14, 2013
    Location:
    Texas
    #1
    I know I used to read that it was good to let a lithium battery die all the way once a month or so for battery calibration.

    Is this still the case? Will it do more harm than good? It will likely be traded in or sold within 2 years but if not, I'm okay with paying for a replacement through Apple.

    I know Apple considers a charge cycle to be 50% up to 100% (What I read online).

    I'm curious as it appears my battery sometimes dies much more rapidly even with the exact same use as always. Then it stays at 99% for over two hours.

    Is the calibration off?
     
  2. C DM macrumors Westmere

    Joined:
    Oct 17, 2011
    #2
    A full discharge once in a while can help keep the battery meter calibrated properly or at least better. It doesn't really help the battery itself, and if it only happens once in a while it won't really do anything noticeably bad to the battery. If it happens fairly often or on a regular basis it can actually make the battery worse over time.

    A full cycle is a 100% charge or multiple charges that add up to it, whether it's one 0 to 100 charge, two 50 to 100 charges, one 20 to 70 and one 40 to 90 charges, etc.
     
  3. Septembersrain thread starter Contributor

    Septembersrain

    Joined:
    Dec 14, 2013
    Location:
    Texas
    #3
    Thank you. I haven't had my 7+ die all the way as of yet. I've had it since the second week of December so it's been over a month. Lately it has just started acting strange by charging up to 99% real fast but then sitting on 99% for about two hours. I don't think it's the new beta because it didn't do it right away after updating. It was about a week later.
     
  4. Tech Fun macrumors member

    Joined:
    Apr 3, 2016
    #4
    I would run the phone down 10 - 20% should be enough and then charge back up to 100% and charge for a further 2 hours to make sure it is fully charged.
    If that fails to work maybe run the phone down to 1% try not to let it shut down and then charge back up like I described.
    I do this with my phone roughly every 6-8 weeks and all seems good.

    Good Luck
     
  5. Mlrollin91 macrumors G5

    Mlrollin91

    Joined:
    Nov 20, 2008
    Location:
    Ventura County
    #5
    I would avoid letting your battery die completely if possible. Letting a lithium ion battery completely die can increase the rate at which it will degrade. Same goes for overcharging as well.
     
  6. deano1972 macrumors 6502a

    deano1972

    Joined:
    Sep 16, 2016
    Location:
    United Kingdom
    #6
    I would charge it when it's between 20 and 50% as a rule but maybe once every couple of months let it drain to 1% to calibrate .. but put it on charge before it switched itself off if possible
     
  7. Newtons Apple macrumors Core

    Newtons Apple

    Joined:
    Mar 12, 2014
    Location:
    Jacksonville, Florida
    #7
    I would plug it into the charger before I went to sleep every night and not worry about it. No need to do all this discharge stuff unless you are having trouble. Too much worry about the battery!
     
  8. Septembersrain thread starter Contributor

    Septembersrain

    Joined:
    Dec 14, 2013
    Location:
    Texas
    #8
    I am having trouble though. =(

    It oddly gets stuck for two hours at 99% charged. When it's fully charged and being used, it'll lose a huge amount quickly. Then it'll taper off and start regulating properly.
     
  9. Tech Fun macrumors member

    Joined:
    Apr 3, 2016
    #9
    I would read the post again
    --- Post Merged, Feb 5, 2017 ---
    iPhones typically stay at 100% for a while before starting to drop
     
  10. Septembersrain thread starter Contributor

    Septembersrain

    Joined:
    Dec 14, 2013
    Location:
    Texas
    #10
    Using my 6s right now. I went ahead and risked it dying. It stayed at 1% for almost an hour. So something definitely seems off. Hmm.

    We shall see when it's fully charged if this issue is solved for me.
     
  11. Tech Fun macrumors member

    Joined:
    Apr 3, 2016
  12. imagineadam macrumors 65816

    Joined:
    Jan 19, 2011
    #12
    I agree! I used to be obsessed with my battery and percentages but ever since I turned off the percentage and just use the phone and plug it in every night before bed everything is fine and no worries. I suggest OP does the same along with everyone else! And yes it's normal for the meter to stick at 100% or 99 for an hour or two after you stop charging and then eventually the meter will catch up. This is just the way iOS's algorithm is set up with how it reads the voltage of the battery and to give you the illusion you have more battery than you actually do at the beginning of a full charge.
     
  13. Septembersrain thread starter Contributor

    Septembersrain

    Joined:
    Dec 14, 2013
    Location:
    Texas
    #13
    It's better. No more issues with quick drain. It has the normal behaviour of staying at 100% for a while, then gradually going down. No more 100% to around 80% rapidly. It seems to be fixed to me. I'll have to see when I charge it again if it gets stuck at 99% for hours but I doubt it will.
     
  14. M_Johnson macrumors newbie

    Joined:
    Feb 7, 2017
    #14
    Mine also stays on 99% for a long time while charging! I hope it wont affect the battery life over time, if I unplug it before it get to 100%.
     
  15. Septembersrain thread starter Contributor

    Septembersrain

    Joined:
    Dec 14, 2013
    Location:
    Texas
    #15
    Hmm. I hope not. I'm about to have to charge my 7+ again. I'll see if it does the same issue with staying on 99% for one and a half to two hours.
     
  16. decafjava macrumors 68020

    decafjava

    Joined:
    Feb 7, 2011
    Location:
    Geneva
    #16
    I was under the impression that the firmware prevents a complete discharge anyway? Not that is' a good thing to do.
     

Share This Page