does the MBA really not need a battery calibration like the Apple site says?

Discussion in 'MacBook Air' started by Bottomsup, Mar 4, 2012.

  1. macrumors regular

    Joined:
    May 10, 2011
    #1
    only reason i ask is that i use my MBA every day...all day...love it, however my battery is reporting 88% health :-(

    cycles == 94

    I bought it the day the 2011 model came out.

    Is it worth running from full charge down to absolute zero until it dies despite what this site says?

    Thx

    http://support.apple.com/kb/HT1490
     
  2. macrumors 6502a

    Joined:
    Oct 5, 2007
    Location:
    Liverpool, UK
    #2
    My battery on my MBA 11 is reporting 93% after 87 cycles, not too bad, i think they will go lower and higher over time, don't worry about it, can always get the battery replaced under warranty if it continues to dive.
     
  3. thread starter macrumors regular

    Joined:
    May 10, 2011
    #3
    what's the warrenty policy on battery replacement? does it need to meet some lower limit to require or can you just walk in and say. "not good enough..please replace"

    thanks
     
  4. macrumors 68020

    LostSoul80

    Joined:
    Jan 25, 2009
    #4
    Calibrate your battery at least once a month, that should be enough.
    The battery's reported health does change continuously, don't worry about it.
     
  5. macrumors 6502a

    Joined:
    Oct 5, 2007
    Location:
    Liverpool, UK
    #5
    I think its around 80% or less, i can't remember to be honest.
     
  6. macrumors 65816

    Joined:
    Jan 5, 2011
    #6
    I don't think any calbration is necessary - certainly not once a month.
     
  7. macrumors 6502a

    Beanoir

    Joined:
    Dec 9, 2010
    Location:
    51 degrees North
    #7
    Had my MBA for well over a year, never calibrated the battery and it reports 100%.

    Battery calibration is nonsense and the effect it gives the owner is placebo, nothing more.
     
  8. thread starter macrumors regular

    Joined:
    May 10, 2011
    #8
    this raises the question....why is yours at 100 and mine in the 80s? how many cycles do you have?
     
  9. macrumors 6502a

    Beanoir

    Joined:
    Dec 9, 2010
    Location:
    51 degrees North
    #9
    No idea, perhaps the battery is faulty? Mine reads the following...

    Health Information:
    Cycle Count: 173
    Condition: Normal
     
  10. thread starter macrumors regular

    Joined:
    May 10, 2011
    #10
    ok that makes sense. mine is normal too, however i'm checking health via iStat. You are using only 'system info'. Install iStat into the dashboard and let me know what you get.

    thx
     
  11. macrumors 6502a

    Beanoir

    Joined:
    Dec 9, 2010
    Location:
    51 degrees North
    #11
    Ahh...now you see I thought you were talking about battery charge, as that is why a lot of people calibrate their battery when it will no longer report 100% from a full charge.

    Anyway, interesting comparison, downloaded it, it's quite a nice little app, I might actually pay for the full version.

    In the battery drop down menu it's showing me
    Cycles: 173
    Health: 94%

    Does that help?
     
  12. thread starter macrumors regular

    Joined:
    May 10, 2011
    #12
    it does help thanks. I'm draining my battery right now. :) i wonder if a full drain will improve my 88%. will report back
     
  13. macrumors 65816

    Joined:
    Jan 5, 2011
    #13
    You are using a 3rd party app to interpret battery health? Is it accurate?

    BTW - I like iStat as well.
     
  14. IngerMan, Mar 4, 2012
    Last edited: Mar 5, 2012

    macrumors 6502a

    IngerMan

    Joined:
    Feb 21, 2011
    Location:
    Buffalo, NY.
  15. macrumors G5

    gnasher729

    Joined:
    Nov 25, 2005
    #15
    Battery calibration does not affect how much charge the battery holds. It affects whether the Mac knows correctly what the charge is. So if you go for a long time without calibration, the number displayed is not the truth anymore. After calibration, the display should be correct again.
     
  16. macrumors 68040

    Cynicalone

    Joined:
    Jul 9, 2008
    Location:
    Okie land
    #16
    I don't really think the calibration matters anymore.

    I bought this Air on July 21st 2011. I'm on the battery almost everyday and this is what mine looks like.

    Screen Shot 2012-03-04 at 7.25.51 PM.png

    It goes down to 92% then climbs back up to 96%.

    It's not uncommon for me to run it down to almost nothing nearly everyday. I make the battery work. :)
     
  17. macrumors member

    Joined:
    Feb 12, 2012
    Location:
    Austin, TX
    #17
    Weird, I have iStat installed and I have 201 cycles with 91% Health. I think I have only calibrated it once since I got the laptop when it first came out. I would have to agree with the general consensus here that it's not that big of a deal to calibrate it unless you are having problems with the time/percentage being reported incorrectly. It definitely won't improve the battery's overall health.
     

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  18. macrumors 65816

    boy-better-know

    Joined:
    Jun 30, 2010
    Location:
    England
    #18
    From what I have read and info gained from GGJ, I run my battery down to 50% every three days or so ( however, I am not strict on this, I am in and out of Uni all the time so it varies), and completely discharge the battery on the first day of every month.
     
  19. macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #19
    The built-in batteries in the newer Mac unibody notebooks come pre-calibrated and do not require regular calibration like the removable batteries.
    No, it's not.
    This should answer most, if not all, of your battery questions:
    You never have to completely discharge the battery. You only need to put cycles on it.
     
  20. macrumors 65816

    Joined:
    Jan 5, 2011
  21. macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #21
    LOL! With the Battery FAQ appearing in over 1,000 threads on this forum, you'd think there would be less misinformation and confusion about batteries being posted by now. I'm surprised that more people aren't posting the link to it as their first response.
     

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