8 hours charging time

Discussion in 'MacBook Air' started by ant043, Jun 29, 2008.

  1. ant043 macrumors regular

    Joined:
    Apr 20, 2008
    Location:
    Ireland
    #1
    Well guys

    This is my first post on macrumors so hello everybody. I bought a macbook air just over a month ago and am loving it. Last week i let the battery run until the computer shut down and since then it is taking me 8 plus hours to recharge the battery. Before that it was not taking any longer than 4 hours. I'm worried that battery may be permanently damaged. Is emptying the battery completely of charge bad ?

    Thanks for the help.
     
  2. Sesshi macrumors G3

    Sesshi

    Joined:
    Jun 3, 2006
    Location:
    One Nation Under Gordon
    #2
    No. It's not your machine.

    Or - well, to put it another way mine does exactly the same thing. Because of the short battery life for an 'ultra'portable, I run it down every time I take it out.

    According to Apple, this is 'normal', although none of the staff nor Applecare were able to point me to any documentation in this regard. That doesn't surprise me given Apple's complete inability to engineer solid products for anyone other than the sort of people who sit in Starbucks twittering or blogging - but you'll notice that the charging time is shorter if you keep the machine powered up (i.e. not slept).
     
  3. maestrokev macrumors 6502a

    maestrokev

    Joined:
    Apr 23, 2007
    Location:
    Canada
    #3
    You're supposed to completely drain your battery once a month to maintain it. After it fully recharges I don't let my laptop drain to sleep until next month so I don't have the 8hr charge times.
     
  4. miniConvert macrumors 68040

    miniConvert

    Joined:
    Mar 4, 2006
    Location:
    Kent, UK - the 'Garden of England'.
    #4
    My 1.8/SSD charges fine, certainly doesn't take 8 hours a pop. I've run it flat several times. I get great battery life.

    Some people have had issues - if you're not happy, contact Apple.
     
  5. ant043 thread starter macrumors regular

    Joined:
    Apr 20, 2008
    Location:
    Ireland
    #5
    thanks for the replies guys. we don't even have an apple store in ireland and i don't want to lose the machine for a few days. I think i'll leave it a week before deciding to contact apple.
     
  6. mhnajjar macrumors 6502a

    mhnajjar

    Joined:
    Mar 3, 2008
    #6
    Get a PC since many of them are assembled in Ireland :p
     
  7. ant043 thread starter macrumors regular

    Joined:
    Apr 20, 2008
    Location:
    Ireland
    #7
    no way ! I'm never going back to windows again. I am definitely a convert. Is it better to charge the air while it is awake, asleep or just powered off ?

    Thanks
     
  8. iHerzeleid macrumors 6502a

    iHerzeleid

    Joined:
    May 5, 2007
    #8
    My fully powered MBA loses 13% battery life overnight just sleeping. Takes one hour to recharge all that =\
     
  9. mhnajjar macrumors 6502a

    mhnajjar

    Joined:
    Mar 3, 2008
  10. spacecadet610 macrumors 6502

    Joined:
    Mar 11, 2006
    #10
    yep my MBA takes forever to charge. annoying. couldn't get a straight answer about why either. Some people have the problem. some don't.
     
  11. n0de macrumors 6502

    Joined:
    Feb 3, 2005
    #11
    Mine did this before I reset the PRAM. Now it takes about 1 hour to get to 80% and another 1.5 hours to 100% (if on and plugged in). For some reason it seems to charge to 100% faster if it is asleep instead of shutdown.
     
  12. eXan macrumors 601

    eXan

    Joined:
    Jan 10, 2005
    Location:
    Russia
    #12
    And why do you leave it unplugged overnight?
     
  13. iHerzeleid macrumors 6502a

    iHerzeleid

    Joined:
    May 5, 2007
    #13
    I did this just to test how much it loses.
     
  14. eXan macrumors 601

    eXan

    Joined:
    Jan 10, 2005
    Location:
    Russia
    #14
    aa ok :)
     
  15. ant043 thread starter macrumors regular

    Joined:
    Apr 20, 2008
    Location:
    Ireland
    #15
    how do you reset the pram ? complete noobie here
     
  16. mhnajjar macrumors 6502a

    mhnajjar

    Joined:
    Mar 3, 2008
    #16
    Hold Command + Option + R (I think :rolleyes:) upon starting the machine and release them when the machine restarts (you will hear a noise).
     
  17. Alkiera macrumors regular

    Joined:
    Mar 11, 2008
    #17
    The reason it takes so long is due to the MBA trickle charging the las 20-25%, and the first 20% or so. If you get it down very low, it takes forever to charge.

    You can watch this using a tool like MiniBatteryLogger, which shows the charge amperage; normally it's 1.6a, but when the battery is very low, or nearly full, it only uses 0.52 amps; or about 1/3 full power. Lithium Ion batteries are fairly sensitive to such things, it wouldn't surprise me if that extended battery life.
     
  18. NC MacGuy macrumors 603

    NC MacGuy

    Joined:
    Feb 9, 2005
    Location:
    The good side of the grass.
    #18
    Mine will take an inordinate amount of time to charge the first time after a total draining. After that it'll be about 4 hrs. Two to 80% and two to get to 100%. I think it's the Apple battery/power recalibration process that happens like when new repeats when battery goes into deep sleep or total depletion mode. My experience anyway...
     
  19. ant043 thread starter macrumors regular

    Joined:
    Apr 20, 2008
    Location:
    Ireland
    #19
    also my battery health according to istat pro is 94 percent after 30 cycles. Should i be worried or is this normal ??

    Thanks
     
  20. ant043 thread starter macrumors regular

    Joined:
    Apr 20, 2008
    Location:
    Ireland
    #20
    make that 93 percent, its gone down again. coconut battery also has it at 93. My macbook is through 100 cycles and still at 100 percent.
     
  21. magid macrumors 6502

    magid

    Joined:
    Jan 6, 2003
    #21
    Fixed
     
  22. PLin macrumors 6502

    Joined:
    Oct 9, 2003
    #22
    For those of you who are experiencing long charge times for the MacBook Air, do you eventually reach 100% though?

    I used my MBA to about 7% and plugged in the charger the other night, and after 12 hours, it still didn't reach 100%. The LED was still orange, and the MBA was stuck in the Finishing Charge stage at 99%.
     
  23. magid macrumors 6502

    magid

    Joined:
    Jan 6, 2003
    #23
    Yeah, there are def some funky battery issues with the mba.
     
  24. n0de macrumors 6502

    Joined:
    Feb 3, 2005
    #24
    For those not getting to 100%; use your MBA on battery only until it gets to 75%, then plug it in. Now it will get to 100%.

    I have noticed that if I use mine plugged in all the time, eventually it will start to drop from 100 down to about 95 and will only charge back up to 99 - unless I run it down a bit without AC.

    I am guessing it is some sort of poorly implemented charging/heat management gone awry.
     
  25. ntrigue macrumors 68040

    ntrigue

    Joined:
    Jul 30, 2007
    #25
    I logged-in to understand why the light is still amber after 9+ hours. Am I going to make the calibration null and void to turn it on now? I've got work to do...
     

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