Battery Drain like Whoa

Discussion in 'MacBook Air' started by cramazing, Jul 27, 2013.

  1. macrumors 6502

    Jun 17, 2012
    so i just got my new 13 MBA

    it was charged to 100% at night before i slept, unplugged the power cord, and i woke up this morning, down to 20%.

    what happen?

    i didnt shutdown the machine and put it to sleep, does it not work like that?
  2. macrumors regular

    Jun 23, 2013
    United Kingdom
  3. thread starter macrumors 6502

    Jun 17, 2012
  4. macrumors 6502

    Nov 21, 2010
  5. thread starter macrumors 6502

    Jun 17, 2012
    I'm not sure, probably have to check that when I get home and that could be the problem.
  6. macrumors regular

    Jun 17, 2013
    Whats a powernap ?
  7. macrumors 6502

    Nov 21, 2010
    It allows the Air to do work while in sleep mode. "While sleeping, your Mac can back up using Time Machine and periodically check for new mail, calendar, and other iCloud updates."

    I would enable it while on AC but disable while on battery. This can be found in the system preferences>energy saver.

    Also, when new, the Air will do a lot of work organizing files and updating apps and restoring files if you used migration assistant to move all your files and settings to your new Mac.

    I'd keep an eye on the battery usage over the next few days. You should see an improvement. If not then it's time to call or visit Apple.
  8. macrumors 65816

    May 1, 2009

    i'm a little unclear on the problem here -are you saying you manually put it to sleep?
  9. thread starter macrumors 6502

    Jun 17, 2012
    yes i do that every time i go away from my laptop knowing i wont use it for a few hours


    yeah this was checked and could be the reason, im going to uncheck this
  10. macrumors regular

    Apr 13, 2013
    The Republic of Texas
  11. macrumors P6


    Jan 23, 2005
    I have a 2013 MBA and have Powernap turned on, and have never seen anything like the battery drop when sleeping you are seeing. I think you have something else going on.

    With Powernap turned on my battery does not even drop 2% overnight.
  12. thread starter macrumors 6502

    Jun 17, 2012
    i dont know, its brand new, i just got it and didnt even install anything on it yet!
  13. macrumors P6


    Jan 23, 2005
    I would take it back and exchange it. Like I said, that is not even close to expected battery life when asleep even with Powernap on.

    Apple's own tests with 30 day battery life when asleep are with Powernap on (default settings).

  14. macrumors 65816

    Jan 5, 2011
    Just give it a few more days. if it continues, you can always exchange later.
  15. macrumors 65816

    May 1, 2009
    you can also try and see what's waking the computer up by copy and pasting this into terminal:

    syslog |grep -i "Wake reason"
  16. AXs
    macrumors 6502a


    Sep 7, 2009
    i dont see the need to put these beasts to "sleep".

    yea if i was going to grab something from the fridge... or maybe a shower.

    it takes 10 seconds to boot. why not just shutdown if youre afk?

    hell even for 10 minutes i'll shutdown, and set to reopen windows on boot
  17. macrumors 6502a


    Jul 12, 2012
    I've noticed that when I have my external monitor connected that the battery will drain faster overnight but nothing like what OP is saying :eek:
  18. macrumors 6502a

    Apr 21, 2009
    I do the same thing if am going to use the computer soon sleep mode, if am going to sleep you better off turning it off
  19. macrumors regular


    Dec 16, 2010
    I use three cloud services, MS SkyDrive, Dropbox and Box. During my Air's initial setup, it was draining battery in less than two hours. That was my expectation. Now that all of my files are synch'd, I expected the battery time to improve.

    However, it would appear that of those three, SkyDrive is a battery drainer. It synch's much slower than the other two and it is running more often in the background. It's as if their synch algorithms are inefficient.

    Without SkyDrive running, I get around 6-8 hours before I need to plug-in.

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