Kinda shocked by Battery Life

Discussion in 'MacBook Air' started by Motawa, Aug 17, 2014.

  1. Motawa macrumors 6502

    Joined:
    Jun 24, 2012
    #1
    So, i just got a macbook air. Its in good condition.

    But the battery life is kinda really bad.. When i do nothing it says 5hours(100% charged, display on 60-70%, wifi connected)

    And when i play starcraft 2 it says 1:45? wth?(i know gaming is demanding but 1:44h??)

    battery health says 91% condition=good
     
  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2
    Normal every day tasks like browsing or checking mail or even watching video or listening to music are not CPU intensive, playing a game like Starcraft is, thus the hit in battery life.

    ______________________________________________________
    This should answer most, if not all, of your battery questions:
    Apple Notebook Battery FAQ by GGJstudios
    The F.A.Q. includes the following topics:
    • BATTERY INFORMATION
    • BATTERY LIFE FROM A CHARGE
    • AC POWER
    • CALIBRATION
    • BATTERY LIFESPAN
    • CHECKING STATUS AND HEALTH
    • CHARGING
    • WHAT IS A CYCLE?
    • BATTERIES ARE NOT COVERED
    • BULGING OR SWELLING BATTERY


    ______________________________________________________
     
  3. Motawa thread starter macrumors 6502

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    Jun 24, 2012
    #3
    Like I said. It says 5 hours when i do nothing

    I read some reviews where people get 6+ hours when turning brightness to 100% and cpu 100% usage
     
  4. ckeck macrumors 6502a

    ckeck

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    Texas
    #4
    What model/year MBA is this? Also try downloading Coconut Battery and report back with the number of cycles on the battery.

    Is it still under warranty?

    Normal use aside, playing a game like StarCraft, 1-2 hours sounds about right. Batteries simply don't hold up under sustained CPU/GPU load.
     
  5. Motawa thread starter macrumors 6502

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    #5
    late 2013. It has 300 cycles. Whats weird is that it charges really fast. 5 minutes for 7 percent.
     
  6. simsaladimbamba

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    #6
    Please link to those reviews, as that sounds ridiculous. 100 % CPU usage does not get you 6 hours of battery life.

    ----------

    300 cycles in less than one year?
    How do you use it?
    Charge it until it is fully loaded, disconnect when fully charged and let the battery drain until it is almost at zero and charge again?

    If so, please read the FAQ I linked to.

    ----------

    It may load fast with the first 75% to 80% of the battery, but the rest to 100% will take longer.
     
  7. Motawa thread starter macrumors 6502

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    Jun 24, 2012
    #7
    its a used one. Battery Health says its 1.1 years old. Whats strange is that when i first checked the battery left time (i just got this macbook today) it said 9h left at 90% battery. Could it be because of WLAN?

    Maybe i will charge it to 100 and then let it die out.

    ----------

    ----------

    [/COLOR]

    It may load fast with the first 75% to 80% of the battery, but the rest to 100% will take longer.[/QUOTE]

    Well it didn't. It went from 93-100 in like 10 minutes.


    something must be wrong. It says time till fully charged 25 minutes at 99% and then 1 minute later it was 100%
     
  8. Meister Suspended

    Meister

    Joined:
    Oct 10, 2013
    #8
    9h on 90% sounds fine to me.

    Like simsaladimbamba wrote, I doubt people get 6+h on 100%cpu and brightness.

    For webbrowsing and some word editing on full brightness you might get approx 7 1/2.
    Playing video games will suck your battery pretty much instantely.
     
  9. Motawa thread starter macrumors 6502

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    Jun 24, 2012
    #9
    all i am doing is downloading a file in safari.
     

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  10. Meister Suspended

    Meister

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    Oct 10, 2013
    #10
    brightness?
     
  11. Motawa thread starter macrumors 6502

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    Jun 24, 2012
    #11
    60%

    oh yeah, and i am using a bluetooth mouse. I Guess thats killing the 7-12 hour battery life then...
     
  12. Meister Suspended

    Meister

    Joined:
    Oct 10, 2013
    #12
    you should get better battery life.
    Use tha mba and see how long it lasts on 75%. Thats :apple: test brightness.
     
  13. Motawa thread starter macrumors 6502

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    Jun 24, 2012
    #13
    i will report back!

    thanks so far.
     
  14. simsaladimbamba

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    #14
    Have you looked at Activity Monitor yet, as the guide I linked to suggests if the battery is draining faster than it should?
     
  15. Motawa thread starter macrumors 6502

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    #15
    Only thing that sticks out is that kernel task is always at 20-30% but thats normal i guess
     
  16. simsaladimbamba

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    #16
    No, it is not. My kernel_task is using 0.8 to 2 % of CPU power on my Mac.
     
  17. Motawa, Aug 17, 2014
    Last edited: Aug 17, 2014

    Motawa thread starter macrumors 6502

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    #17
    I found it

    as soon as i turn my wifi and connect to my router kernel_task kicks up.
     
  18. ckeck macrumors 6502a

    ckeck

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    Texas
    #18
    Backup and clean install Mac OS. Don't restore, just manually backup and perform a clean installation.

    OS install might be borked.
     
  19. Motawa thread starter macrumors 6502

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    Jun 24, 2012
    #19
    fresh install. Nothing open except activity monitor. Says 6 hours on a full charge...
     

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  20. simsaladimbamba

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  21. Motawa, Aug 18, 2014
    Last edited: Aug 18, 2014

    Motawa thread starter macrumors 6502

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    #21
    I don't know why but now it says 9hours.

    Yesterday it ran only about 4 hours(like it was displayed)

    edit: now its back to 6 hours
     

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  22. simsaladimbamba

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    #22
    It says 9 hours now due to 98% of the CPU being unused, and the previous screenshot saw only 36% of the CPU being unused, thus my advice to show ALL PROCESSES. But know that CPU hungry process has calmed down as it seems.

    Maybe it was Spotlight indexing or something else.

    ----------

    What does Activity Monitor say now?

    You also should know, that that time indicator is calculated all the time due to the current CPU usage and all that goes into battery life.
     
  23. ashman70 macrumors 6502a

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    Dec 20, 2010
    #23
    This is using the current Yosemite public beta? Why would you be shocked at the battery life of an OS that isn't even released yet? Whatever battery life you are getting on the beta will surely be different on final release and I am sure it may even take a few releases after that to tweak it.
     
  24. legioxi macrumors 6502a

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    Mar 2, 2013
    #24
    If any page is running flash (i.e. ads), that will tank your battery life as well.
     
  25. Weaselboy Moderator

    Weaselboy

    Staff Member

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    California
    #25
    +1

    OP>> Battery life is going to be all over the place on the Yosemite beta. Just erase it and go back to Mavericks if you want good battery life.
     

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