Brand new MBA13" (early2014) battery drain?

Discussion in 'MacBook Air' started by qwdudeqw, Jan 1, 2015.

  1. qwdudeqw macrumors newbie

    Dec 30, 2014
    hey y'all, so I just got a new MBA13" (early 2014 version; Yosemite 10.10) and it seems like the battery is going faster than the advertised 12h. All I've got is 2 Safari tabs, and one PDF open in preview, but after only 2 hours i'm already down to 70% (estimated 6h remaining)...I got off apple support yesterday and they told me to do a SMC reset to resync the battery monitor, but no luck.

    In terms of stats, Activity Monitor tells me Im only using 2% of total CPU, and the biggest thing I'm running is 2 tabs in Safari...

    Is anyone else having this issue? Solutions? Since I still have warranty, do you guys think I should return this one and get a new one in hopes of better battery...
  2. motrek macrumors 68020

    Sep 14, 2012
    Do you have anything plugged in via USB?

    Screen brightness?

    When did you get the machine? I would use it for a few days and see what the actual battery life is vs. software predictions.
  3. tdhurst macrumors 601


    Dec 27, 2003
    Phoenix, AZ

    Have you actually run the battery all the way down and timed it?
  4. qwdudeqw thread starter macrumors newbie

    Dec 30, 2014
    Thanks for your response!! I'm currently in the process of running it down so I'll update later haha...I do have a USB flash drive in (but ejected it)...but can that thing really suck up that many hoursnof energy?
  5. motrek macrumors 68020

    Sep 14, 2012
    Probably not but if you were running an external hard drive or charging an iPhone then that could easily cut your battery life in half.

    BTW -- please download the Battery Health app and see how much capacity it's reporting vs. original capacity. That will tell you if something is wrong with the battery vs. software using all your power.
  6. qwdudeqw, Jan 1, 2015
    Last edited: Jan 1, 2015

    qwdudeqw thread starter macrumors newbie

    Dec 30, 2014

    Attached is the report for my battery - everything seems to be normal. Nothing energy intense in my CPU either...Very odd. And note how the battery monitor is giving me such low-ball hours. As of now, I've used it for about 4.5h on the battery.

    Attached Files:

  7. motrek macrumors 68020

    Sep 14, 2012
    I don't see an attachment.
  8. qwdudeqw thread starter macrumors newbie

    Dec 30, 2014
    Apologies! Here you go :) Edited prev post
  9. johannnn macrumors 65816


    Nov 20, 2009
    You've used it 4,5h and have 52% left? That sounds perfectly fine.

    USB drives and flash are two frequent battery killers in my experience.
  10. motrek macrumors 68020

    Sep 14, 2012
    Yeah, Apple's advertised battery life of 12 hours is for "web browsing." Turning your screen brightness up or doing something a little more CPU intensive could easily turn 12 hours into 9.
  11. qwdudeqw thread starter macrumors newbie

    Dec 30, 2014
    Now, another thing to note would be that I'm leaving in a USB 3.0 (but ejected)...would that significantly affect battery life? Not sure if that makes a diff at all.
  12. GGJstudios macrumors Westmere


    May 16, 2008
    Yes, it could. If you don't need it, unplug it to maximize battery life. There are many factors that impact your battery life. See the BATTERY LIFE FROM A CHARGE section of the following link for details, including tips on how to maximize your battery life.
    The link below should answer most, if not all, of your battery/charging questions. If you haven't already done so, I highly recommend you take the time to read it.
  13. motrek macrumors 68020

    Sep 14, 2012
    A USB 3 what? Flash drive? Hard drive?

    Depending on the make and model, an external hard drive might keep spinning even after being "ejected" and that would be an enormous power drain.

    Otherwise you're talking about keeping some controller chips powered, probably in some kind of idle state. That takes a non-zero amount of power but probably not very significant either. After all, a lot of power running through a USB device would overheat and fry the chips.
  14. joshlalonde macrumors 6502


    Jul 12, 2014
    Oh, make sure to turn off bluetooth! That's not included in the 12 hour estimate :)

    Don't worry, I get the 12 hour estimated battery even when I'm not web browsing, or at least It doesn't run out before I need it to. It always has like 20% left before I plug it in.

    Besides, think about other "all-day battery life" promising devices like Surface Pro 3 which only offer 9 hours browsing.

    I've played Minecraft (fairly intensive, gets the fans running loud, hot) on battery before and by the time I realized, it had been 2 hours and there was still 6 hours remaining estimated.

    Don't worry about battery, just enjoy your MacBook.

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