What's with the 1-2% instant drop on unplug?

Discussion in 'iPhone' started by tsduke, Oct 19, 2011.

  1. tsduke macrumors regular

    Oct 10, 2011
    When I look at my 4S in the morning from an overnight charge it shows 100% while showing the full charge icon. As soon as I unplug it it drops to 98% or 99%. I've never seen any phone do this. Including my iPhone 4 before this.
  2. JP30 macrumors newbie

    Oct 12, 2011
    Same with mine when I unplugged yesterday, within minutes was down to 99-98% but overnight I only lost about 2-3% on standby which is an improvement I think
  3. tsduke thread starter macrumors regular

    Oct 10, 2011
    Just to clarify...I get the 1-2% drop instantly on unplug from power.
  4. filmfanatic24 macrumors 6502

    Sep 5, 2007
    I have a weird issue where I plug it in to charge it overnight and when I wake up it is at 92% and the usage claims it has been fully charged.
  5. EmbraceTheOne macrumors 6502a

    Aug 26, 2011
    I think it's no problem and you don't have to worry about anything.
  6. nomad01 macrumors 68000


    Aug 1, 2005
    Birmingham, England
    Had the same thing this morning. Unplugged, plugged back in again and it charged back up.

    Then stayed at 100% for ages before saw any drop. <shrugs>
  7. tsduke thread starter macrumors regular

    Oct 10, 2011
    I certainly think it's a problem. Instanst 2% drop with no use.:rolleyes:


    Same with me when I plug back in and charge back to 100%.
  8. chrisu91 macrumors regular

    Jun 28, 2010
    Ontario, Canada
    It's happened with all my iPhones. Likely didn't notice it. Once it gets to 100%, it stops charging (or trickle charges). Instead of constantly charging to keep it at 100%, the phone allows it to drop a percentage or two, and then starts regular charge to top up again. This is my theory anyways. There is nothing wrong with your phone.
  9. Hudzilla macrumors 6502a


    Nov 12, 2007
    If you look around on this forum, you'll see there are ALOT of people having battery issues.

    Most likely a software issue.
  10. tsduke thread starter macrumors regular

    Oct 10, 2011
    I promise you my 4 never did this. It stayed at 100% when unplugged.
  11. Small White Car macrumors G4

    Small White Car

    Aug 29, 2006
    Washington DC
    Because battery indicators are never perfectly accurate to more than 2 or 3%

    Your 98% phone could have more of a charge than the guy with 100%. Or the same. You can't really know and thus it's pointless to worry about the % in any increments less than 5.
  12. ccsicecoke macrumors regular

    Aug 19, 2010
    I would take it as a good sign. It will be able to be charged more next time.

    The only thing you should be worried about is 1% instant increasing say you unplug it while being charged at 99%
  13. urkel macrumors 68030

    Nov 3, 2008
    Most likely, but not definitely. And that my concern. Maybe it's a countdown issue and that last 10% will last us two hours, but maybe the hardware is too powerful and dual core means twice as fast battery drain.

    I really want an answer because I hate that I've disabled so many selling point features just to last a full workday.
  14. gtmac macrumors 6502a

    Jun 25, 2010
    This is how I feel. Yesterday I had to turn off almost everything just to get better usage. I need a full day of use!!
  15. mmf01 macrumors member

    Oct 17, 2011
    I think this is an iOS 5 issue. Same issue with my iPad 2. Immediatly drops to 98%. Reboot device...Back up to 100% after reboot. Already did the battery meter calibration thing too.
  16. jgalan14 macrumors 6502

    Oct 11, 2011
    No issue here lasted 1 hour on 100% with twitter an tapatalk and some emails :D I was on wii tho
  17. dusters711 macrumors regular

    Aug 12, 2008
    When this would happen on my iPhone 4 or 3GS, I would just restart the phone and it would "recalculate" the battery correctly. It would just happen randomly... like I would be using it for 1 minute and I would notice it at 98% so I restart and I'd be back at 100%. Don't know if that helps or not.
  18. nomad01 macrumors 68000


    Aug 1, 2005
    Birmingham, England
    Yeah I experienced this with my 4 also.

    However this didn't help with the 4s. It came back up with the same 98% charge and began to deplete quite quickly with light use.
  19. iphone1105 macrumors 68020


    Oct 8, 2009
    Same here, this is what i do. It happens to me after a long period of charging, usually overnights while sleeping. It reallly no biggy, your battery isn't borked, just restart it and it will show correct...

    Plus that battery meter % is so off .....
  20. Booju16 macrumors member

    Jun 15, 2010
    Gotham City, NY
    Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3)

    That's exactly what happened to me this morning, I was just about to make a thread about it, but you beat me to it. I went from 100% to 98% right after an unplug from my charger at 100%, what gives?!
  21. yanki01 macrumors 68040


    Feb 28, 2009
    i had this problem on my 3GS, once i got the 4 it went away and haven't seen it since? maybe a restore of the iOS if its really bugging you?
  22. AlpinWeissE90 macrumors newbie

    Oct 17, 2011
    I had this problem as well! It would be at 100% plugged in from an overnight charge. I'd unlock it (still plugged in) and it would drop to 99% and then a few seconds later to 98%.

    Yesterday morning it only charged to 93% despite me unplugging it and plugging it in again. My battery also drained incredibly fast. I couldn't make it through a whole day. I unplug at 7am and I was at 4% battery by 1pm.

    Took it to the Apple store yesterday during lunch and they replaced my phone. I don't seem to have any of the issues anymore but it has only been a day.
  23. dusters711 macrumors regular

    Aug 12, 2008
    Just out of curiosity, did you let your 4S drain all the way to 0% (until it actually shuts off) and then do a full overnight charge yet? I was having quick draining issues that even restarting did not help until I did the complete drain. I usually do this with all my phones when I get them.
  24. ZipZap macrumors 603

    Dec 14, 2007
    Maybe its just a programming issue. Can you tell that you are in fact loosing 2 or 3%?

    Probably not.
  25. boshii macrumors 68040


    Jul 6, 2008
    Atlanta, GA
    Do yourself a favor and turn Battery Percentage off.

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