Why Sierra is so bad for MBA battery?

Discussion in 'MacBook Air' started by StoneJack, Apr 13, 2017.

  1. StoneJack macrumors 6502a

    StoneJack

    Joined:
    Dec 19, 2009
    #1
    My battery is 85% healthy, 2013 11 inch MBA, only 250 cycles. In El Capitan, used to have up to 8 hours of battery life, battery health was also 93% or so. After Sierra install, the battery health in a month worsened to 85%, battery work time fell to 4-5 hours. Tried a new fresh Sierra install, PRAM and SMC reset - nothing helps to recover the battery health.

    So I wonder why Sierra shortens the battery time and aggravates its health, and is there any remedy to it, except installing El Capitan?
     
  2. kohlson macrumors 65816

    Joined:
    Apr 23, 2010
    #2
    Check to see if there are any apps/processes that are using too much energy. Right-click on the battery icon - there's a line that will highlight any apps that are using excessive power; or, "No Apps..." if none. Also, in the Activity Monitor, see is any there are any processes using too much every in the Energy tab.
    FWIW my wife's 2012 13-in MBA needed a battery replacement (got a warning). She primarily runs it plugged in at work. Ut had 300-ish cycles. OTOH, our daughter's 2011 MBA ran for 1000+ cycles - she only plugged hers in when down to the last 10%.
     
  3. Biscotti macrumors regular

    Joined:
    Jun 25, 2008
    #3
    I also saw a huge drop in battery after Sierra. I had just replaced my battery too right before Sierra came out and was seeing 6+ hours easily, and ~2 to 2.5 after Sierra.

    I think Sierra may be 1) Be more processor intensive so our older processor stress more 2) Be more graphically intensive 3) iCloud Drive - uploads everything and changes are always uploading/downloading/pinging.

    I agree, my battery life sucks (-15% battery life in 20 mins typing this reply on and off).
     
  4. Stefan johansson macrumors 65816

    Stefan johansson

    Joined:
    Apr 13, 2017
    Location:
    Sweden
    #4
    Another reason not to buy a MacBook Air... Fortunately,my MBP has ok battery capacity.
     
  5. StoneJack thread starter macrumors 6502a

    StoneJack

    Joined:
    Dec 19, 2009
    #5

    I am downloading El Capitan again and will reinstall clean El Capitan. I don't know whats different but Sierra hasn't been good to my MBA. For my Macbook pro 2016, which still doesn't get much use, Sierra is probably a better choice. After installing EL Capitan, I will share the battery life changes.
     
  6. StoneJack thread starter macrumors 6502a

    StoneJack

    Joined:
    Dec 19, 2009
    #6
    So I installed (downgraded) to El Capitan. Guess what? Battery life for first time in months showed 10 hours (under Sierra the max was 6 hours) and even battery health indicator improved a little bit (from 84 to 87%). Sierra is definitely something to avoid for MBA 2013 (not sure about other releases).
     

Share This Page