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  • noname14 Level 1 Level 1 (0 points)

    I have good news. I left my macbook air on (disabled sleep mode), with automatic brightness, no programs running so that I could time the fully charged battery life. it got exactly 5 hours of battery life before it died. after it died i let it sit there for a few hours.


    then i plugged it back in, without turning it on, until it was fully charged and the light was green. when i finally turned it on, the battery meter said I had 13 hours of battery life left. this was higher than anything i had ever seen before.


    thinking it was a fluke, i left it on again (disabled sleep, no program etc), and after 5 hours of sitting on, it still had 65% battery life left! i'm not sure what happened here. i assume the battery was recallibrated (even though i have been numerous times that macbook airs come pre-callibrated and that this would be a waste of time).


    Needless to say, I am extremely satisfied that I found the solution to this dilemma. If anyone else is having a similar problem I suggest you do what I did. I wish someone from apple supprort would have told me to do this. Clearing the p-ram did nothing. turning it off and restarting did nothing. I had to let the battery fully deplete, sit for a few hours,  then charge it completely before turning it on.

  • rezalution Level 1 Level 1 (0 points)



    so actually just for along the same lines...I decided to keep mine plugged in for longer rather than unplug it as soon as it was charged. I got nearly 17 hours of battery life(this is wish less than 50% brightness).Screen Shot 2013-06-29 at 12.48.58 AM.png

  • RogerTerry77 Level 1 Level 1 (0 points)

    I am not positive, however...

    I believe that a 12 hour, or greater, battery life would come from using the LCD's LED lighting on the lowest level possible, keyboard lightint as dim as possible and all sorts of "limited" things.

    My new MacBook Air arrived on Monday, July 1st, 2013 I didn't bother charging it, as it was fully charged still; 97%.

    I used it on Tuesday, at work, for around 7 hours, Tuesday evening at home, 2 hours and am using it now, 1 hour and some change, to post this very message, and I have 18% battery life remaining. I have a reading of 2 hours and 47 minutes of battery life remaining. These are esitames made by the core system and based on current use and other factors.

    Apple is right in stating "Around 12 hours", its not an assumption or a given, its just an estimate.

    Bring on the Mavericks! We're ready... iOS 7 too...

  • rockstar1987 Level 1 Level 1 (0 points)

    Hi LowLuster. You seem to have a lot of knowledge about the battery of MacBook Air. I just got the latest MacBook Air this week. And after reading your comments I chose not to calibrate it. But what should I do in the future? I went to this site and added the calender reminder. How should I calibrate my battery when the calender says it`s time? Reading your comments I see I shouldn`t run it to zero percent, so how am I supposed to do this? Does running it to 10-20% and then recharging it to 100% qualify as a calibration? Should I follow Tom Nelsons calibration advise:


    Or doesn`t the new Macbook need any calibration at all?


    I would be really thankful if you could give me some advise! :-)

  • LowLuster Level 6 Level 6 (12,050 points)

    Macs that have battery you can not remove do not need to be calibrated and shouldn't be calibrated. They are Pre-Calibrated.

  • rockstar1987 Level 1 Level 1 (0 points)

    Okay, I see. Thank you. The thing that confuses me about the calibration issue with the Macbook Air (Mid 2013) is the text I`ve underlined below from Apples page and where they are talking about lithium-based batteries:

    "Standard Maintenance

    For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Apple does not recommend leaving your portable plugged in all the time. An ideal use would be a commuter who uses her notebook on the train, then plugs it in at the office to charge. This keeps the battery juices flowing. If on the other hand, you use a desktop computer at work, and save a notebook for infrequent travel, Apple recommends charging and discharging its battery at least once per month. Need a reminder? Add an event to your desktop’s iCal. When your battery no longer holds sufficient charge to meet your needs, you may choose to replace it. If your notebook came with a built-in battery, you should have the battery replaced only by an Apple Authorized Service Provider."

    So when Apple is talking about discharging, how should I actually discharge it? If discharging a lithium-based battery completely is harmful for the battery life, then what is the ideal way to do this without harming the battery?

  • LowLuster Level 6 Level 6 (12,050 points)

    Please start your own thread. Thanks.

  • rockstar1987 Level 1 Level 1 (0 points)

    I`m new to this forum, but now I`ve made a new thread. Thank you :-)


  • SidFerreira Level 1 Level 1 (0 points)

    I understand what you posted, but, 30% less battery is just TOO MUCH to lose. Some times my MBA shows less than 6 hours.

    The advertise, even with the small letters, whas about the "Macbook Air 13"...

  • fatihsuzer Level 1 Level 1 (0 points)

    Been using it for more than 5 hours since last full charge and I still have this;


    Screen Shot 2013-08-19 at 05.36.30.png

    (mainly webbrowsing, youtube and also timemachine backed up 20GB data wirelessly in the background)


    13" i5 with 4GB Ram. This is what you guys should be getting around.

  • dtmc Level 1 Level 1 (0 points)

    I have the 2013 Macbook Air i7 with 8GB RAM and 256 hard drive. It's getting great battery life.  More than 12 hours.  Someone in the forum said the i7 could not ever get even close to 12 hours.  Mine does and I have been thoroughly impressed with it since getting it in June 2013.  As you can see from the screen shot below, I have about 84% battery life left which will last 10:55 more hours.  I keep the brightness level at about 1 notch below 50%. 



  • Nishdesai95 Level 1 Level 1 (0 points)

    folks, im having a similar problem with the battery! earlier it used to work great but since a few days what has happened is that the remaining battery keeps fluctuating it says 20:00hours on full charge and by 98%it goes to 15hours and 90% sometimes 11:30 houurs or 12:00 hours sometimes it also increases. i tried reinstalling the OS. do you think my battery is faulty

  • Steviedeehook Level 1 Level 1 (0 points)

    is the one at Best Buy the exact same spec? - Hardware upgrades will decrease the battery life. Bigger processor and more Ram will use more battery.

  • Muki23 Level 1 Level 1 (0 points)

    completely untrue....I have Macbook Air with i7 processor and 4GB RAM and after a 6 month of usage my battery still last for 12 hours long

  • PlotinusVeritas Level 6 Level 6 (14,720 points)

    That's great news then.