Over-charging the 5s?

Discussion in 'iPhone' started by kenknotts, Oct 17, 2013.

  1. kenknotts macrumors 6502

    Sep 23, 2013
    Not sure why this is but if I leave my 5s charging overnight and unplug it after 6-7 hours, its at 100% and the battery will last for quite awhile. If I charge it for 8 hours or longer, it will immediately drop from 100% to 99% once its unplugged and doesnt last as long. Like today. Was plugged in for around 9 hours. Unplugged it an hour ago, it dropped to 99% right away and now its at 89% after only 31 mins of use. Yesterday, it was still at 85% after 3 hours off the charger and 45 mins of use. WTF?
  2. Intell macrumors P6


    Jan 24, 2010
    You cannot overcharge an iOS device. The device's charging circuit will prevent more charging once the battery reports that it is full.
  3. kenknotts thread starter macrumors 6502

    Sep 23, 2013
    Any idea why battery drain occurs much faster when you leave it charging longer than 6-7 hours then?
  4. Mercenary macrumors 65816


    Sep 17, 2012
    When it gets to 100% it stops charging and runs on battery for a bit! then charges, then stops. Sometimes when you unplug you get it after it's been on battery for a bit so will drop.

    It's normal.
  5. LostSoul80 macrumors 68020


    Jan 25, 2009
    Possibly the sensor that measures the battery level needs calibration.
    There is no reason what you are describing could happen, so probably it was just a coincidence. Notice how 1 time is ridiculous for any kind of conclusion.
  6. sumsingwong macrumors 6502a


    Dec 15, 2012
    Once it's fully charged, the charger begins trickle charging. It's shuts off. Once the battery drains a little, the charger activates again to fully charge it. You may have unplugged it, when the device was in draining phase which is why it drops down to 99% shortly after unplugging.
  7. imaginex20 macrumors 65816


    Jun 17, 2009
    same thing happened with my iphone 5 and 5S, when this happens I would just restart the phone and it'll show 100% again. Not sure what is going on...
  8. kenknotts thread starter macrumors 6502

    Sep 23, 2013
    I see. It drops immediately to 99%, like the second its unplugged
  9. AAPLinc macrumors 65816

    Jul 27, 2012
    Hollywood, CA
    Just got my silver 5S a few days ago, waited to activate. Had it on the charger for almost 24 hours, because I forgot I had it charging. Like others have said, once the iPhone is fully charged, it cuts off the charger and just sits idle with a full charge...so essentially you can't overcharge.
  10. Applejuiced macrumors Westmere


    Apr 16, 2008
    At the iPhone hacks section.
    Don't be so hung up on that percentage indicator.
    It might drop 1% within a second and then stay at a certain level for a while and so on.
  11. Mercenary macrumors 65816


    Sep 17, 2012
    Battery level also isn't an exact thing. Shake your phone or heat it up and the chemistry changes and the charge appears higher.
  12. cynics macrumors G4

    Jan 8, 2012
  13. dazedxar macrumors member

    Sep 24, 2013
    Bay Area, California
    The battery work like this:

    -It takes in a lot of juice all the way up to about 90%
    -At 90% it takes juice slowly until 100%
    -At 100% it completely stop accepting any charge and deny any juice
    -The phone uses battery slowly until 97%, but the phone still shows 100%
    -The battery says "Oh I can take a little more" and charge up to 100% again
    -Cycle repeats until you unplug it

    No such thing as overcharging a lithium battery
  14. EM2013 macrumors 65816


    Sep 2, 2013
    I didn't know that, I thought it was bad to leave your phone charging overnight. good to know.
  15. HybridHB macrumors newbie

    Oct 17, 2013
    When I have this issue I just reboot the phone, then it will report what appears to be correct numbers.
  16. Carlanga macrumors 604


    Nov 5, 2009
    yes, the more it's plugged in the more the battery will last.
  17. LithePanther macrumors 6502

    Sep 22, 2011
    That number is an estimate anyways. Battery percentage is really complex and your indicator could say it was 100% but in reality it was only 95%. Or the opposite.
  18. HybridHB macrumors newbie

    Oct 17, 2013
    I know it doesnt matter in reality, but it bothers me when i see it get to 95% within a few mins.
  19. jabingla2810 macrumors 68020

    Oct 15, 2008
    Tip: Turn off the battery percentage and put the stop watch away.

    If you have serious battery issues, you would know about it.
  20. Lucille Carter macrumors 65816

    Jul 3, 2013
    I think you need to stop looking at the battery percentage and just use your phone. You are driving yourself crazy. :p
  21. bp1000 macrumors 65816

    Jul 7, 2011
    My 5s has actually dropped to 99% on the charger

    It definitely uses a little battery and then trickle charges back up
  22. LithePanther macrumors 6502

    Sep 22, 2011
    I used to be like that. It's liberating to not care.
  23. Namji macrumors 6502a


    Aug 13, 2010
    Can someone check to see when their iPhone 5S is fully charged at 100% does the charging / lightning icon is still displayed next to the battery icon?

    The past two nights I charged my phone overnight ( 8+ hours ) and every morning it reads 100% and the charging icon is still displayed as if it shows that it is still charging.. On my iPhone 4 the charging display turns off once the phone has been charged at 100%.

  24. Jimbo47 macrumors 6502a

    Jun 21, 2010
    Mine did this on my 4S during beta and final release. The indicator doesn't change. I guess they tweaked the percentage with iOS 7. Previously, it could read 100% but still be charging. Once it was completely full, the indicator changed to the plug instead of the lightening bolt. Now, once it hits 100% it's completely charged and shuts off, but the indicator doesn't change.

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