Battery won't fully charge?

Discussion in 'MacBook Air' started by Splinx, Dec 29, 2010.

  1. Splinx macrumors newbie

    Splinx

    Joined:
    Dec 29, 2010
    #1
    I just got a new macbook air, it was working fine for a couple of days until yesterday.
    The battery seems to be stuck at 98% - or was. I rebooted because I started to lag, and was updating, then I unplugged it and plugged it back in, then it went down to 97%. What confuses me is the fact it had been plugged in (while shut off), for about 8 hours and it should have been charged by the time I got around to using it. When I right click on the battery icon, it says the computer is fully charged.
    Is there a way to fix this issue?
     
  2. newdeal macrumors 68020

    Joined:
    Oct 21, 2009
  3. MooneyFlyer macrumors 65816

    MooneyFlyer

    Joined:
    Nov 18, 2007
    Location:
    Boston
    #3
    First, if you haven't, you should calibrate your battery. There are numerous threads on this site and http://support.apple.com/kb/ht1490 to give you details on how to do that. If you haven't done it yet, it could be the culprit.

    Second, it could be that the battery isn't charging because you are over a certain threshold. I think it is 96% but I don't remember. This is quite common for laptops. Try running the battery down to 50% and then letting it charge. (provided you've done the calibration).
     
  4. Splinx thread starter macrumors newbie

    Splinx

    Joined:
    Dec 29, 2010
    #4
    I've tried this, it didn't help, only made it drop down to 96% when I turned it on again.
     
  5. Splinx thread starter macrumors newbie

    Splinx

    Joined:
    Dec 29, 2010
    #5
    I'm confused as to how I'm supposed to go through with your first suggestion if the battery refuses to completely charge, though it's saying "battery is charged" when I click the icon. Is this not required, though it's stated in the first step?
    As for your second suggestion, I'll try it.
    Thanks for your help.
     
  6. MooneyFlyer macrumors 65816

    MooneyFlyer

    Joined:
    Nov 18, 2007
    Location:
    Boston
    #6
    Yeah, that should do it. I would just start the process. Perhaps (and this is just a complete guess) the battery is fully charged and the computer thinks that much is 98%.
     
  7. Splinx thread starter macrumors newbie

    Splinx

    Joined:
    Dec 29, 2010
    #7
    Ah, yes. Apparently MBA's don't charge unless at 94% or lower. So, just what you said in your second suggestion seems to have fixed my problem, thanks.
     
  8. powerbook911 macrumors 68040

    powerbook911

    Joined:
    Mar 15, 2005
    #8
    I'm having this problem too though. I was down to 20 percent today.

    Plugged it in. Fully charged, but only charged to 96 percent.


    Furthermore, Coconut battery shows my battery capacity is only at 97 percent of original. What is all of yours at?

    Thanks
     
  9. dmelgar macrumors 68000

    Joined:
    Apr 29, 2005
    #9
    Chill. 2-3% is nothing. Rounding error.

    Lithium-ion batteries don't like being 100% full and staying that way. Charging logic in all Macbooks charges it to around 100% then lets it discharge to 95-96% then back up. As long as its in that range its no problem.

    Similarly, 97% capacity is same as 100% for all intents and purposes. Recalibration might get it to 100% or not. Its very close. Not to worry.
     
  10. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #10
    PRAM has nothing to do with batteries or charging. It won't help at all.
    It's not a "rounding error"
    It's normal and acting as designed. Read the following link for more details:
    This should answer most, if not all, of your battery questions: Apple Notebook Battery FAQ
     
  11. dmelgar macrumors 68000

    Joined:
    Apr 29, 2005
    #11
    Is too...


    The point is its not significant, which you seem to agree with yourself in your post. Not sure what your point is.
     
  12. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #12
    No, it is NOT a rounding error. It's the way charging for Apple portables is designed. Read the CHARGING section of the FAQ I posted. It explains clearly why charging may stop short of 100%. My point is, rather than posting non-factual things that you made up, learn the facts so you don't mislead readers of this forum.
     

Share This Page