Brand new macbook pro can't last more than 3-4 hours

Discussion in 'MacBook Pro' started by MathiasLa, Nov 18, 2011.

  1. macrumors member

    Joined:
    Oct 24, 2011
    #1
    Hallo. I've just gotten my brand new 15'' macbook pro. When fully charged, it says that it can't last more than about 3 hours. Shouldn't it be around 7 hours?
     
  2. macrumors regular

    miker2209

    Joined:
    Jan 2, 2010
    #2
    Defective battery perhaps? try SMC reset and see how it goes.
     
  3. thread starter macrumors member

    Joined:
    Oct 24, 2011
    #3
    SMC? How?
     
  4. macrumors 6502a

    TheJing

    Joined:
    Jun 13, 2011
    Location:
    Somewhere in Europe
    #4
    What are you doing on it when it says it has 3 hours left?
     
  5. thread starter macrumors member

    Joined:
    Oct 24, 2011
    #5
    Just browsing Facebook really.
     
  6. macrumors demi-god

    Joined:
    Oct 14, 2005
    Location:
    Virginia Beach
    #6
    Two thoughts.

    If you haven't done the battery calibration, the estimate that your Mac is giving you could be wrong. (i.e. it may last for more than 3 hours, even though it's only saying 3).

    Depending on what you're doing, you get less battery life. Apple's tests, IMO, aren't very realistic, and I don't think I've seen anyone that gets the amount of battery life that they claim. Having said that, I'd expect that you get more than 3!
     
  7. macrumors regular

    miker2209

    Joined:
    Jan 2, 2010
    #7
    Google Search: SMC reset, very easy.
     
  8. macrumors member

    Joined:
    Jul 25, 2008
    #8
    What browser are you using? Firefox and Chrome suck a lot more juice with the discrete GPU than safari does.
     
  9. TSE
    macrumors 68030

    TSE

    Joined:
    Jun 25, 2007
    Location:
    St. Paul, Minnesota
    #9
    1. Flash will kill it. Use safari and install Flashblock
    2. Install GFXCardstatus and set it to integrated only.
    3. Calibrate your battery.
    4. Any video, games, etc. will kill your battery.

    7 hours is attainable with Microsoft Office and basic web browsing with Safari w/ no flash at 50% brightness running Snow Leopard. That's how it is for me
     
  10. thread starter macrumors member

    Joined:
    Oct 24, 2011
    #10
    Safari.

    Im doing the calibration now. When I charged it up to full, I happened to pull out the charger for a sec. Will that make a difference in calibration?
     
  11. thread starter macrumors member

    Joined:
    Oct 24, 2011
    #11
    Ok so I did the calibration, also tried SMC reset (don't know if I did it right though, nothing happened). It jumps from 3 to 5 hours in estimated time now. Its at 95% atm. What concerns me the most is how fast it goes from like 100% to what I'm on know (95%). It was like 2 mins or something. Isn't this weird?
     
  12. thread starter macrumors member

    Joined:
    Oct 24, 2011
    #12
    Anyone?
     
  13. macrumors 6502

    Joined:
    Sep 4, 2011
    Location:
    Salt Lake City, Utah
    #13
    Don't worry about it.
     
  14. macrumors 65816

    GuitarG20

    Joined:
    Jun 3, 2011
    #14
    what browser do you use? Because if you use chrome, you're engaging the dedicated graphics card, which is probably what's killing your battery life. Try installing gfxCardStatus and setting it to integrated only.
     
  15. thread starter macrumors member

    Joined:
    Oct 24, 2011
    #15
    What do you mean?

    Haha, I already answered that I use safari, and someone said the gfxcardstatus thing as well.
     
  16. macrumors 68030

    Joined:
    Oct 19, 2011
    Location:
    Switzerland
    #16
    Download coconut battery.

    - check the capacity (should be close to 6900 mAh)
    - check the power usage. If you are somewhere between 10-15 Watt, you should be in for 6-7 hours of battery life. If you're more between 25-30, you are looking at 3-4 hours max.

    The sandy bridge quad cores are super fast, but very needy. Whenever you put load on your system, e.g. copying large files, compiling code, flash videos, it will start sucking your power.

    Right now I'm on safari, keyboard light turned off, display 4 bars under full brightness, and using 10.2 Watt. Battery is 71% full and says 5:45 remaining.
     
  17. MathiasLa, Nov 20, 2011
    Last edited: Nov 20, 2011

    thread starter macrumors member

    Joined:
    Oct 24, 2011
    #17
    Im over 30 atm. Why is that?

    Edit: Wow. Literally just jumped too 34.3 watts. Now over 40. Wtf?
     
  18. macrumors 6502a

    TheJing

    Joined:
    Jun 13, 2011
    Location:
    Somewhere in Europe
    #18
    What exactly are you doing atm? Check your activity monitor what's using the power.
     
  19. thread starter macrumors member

    Joined:
    Oct 24, 2011
    #19
    Im watching a video on my external screen.
     
  20. macrumors 6502a

    TheJing

    Joined:
    Jun 13, 2011
    Location:
    Somewhere in Europe
    #20
    No wonder it's using a lot of power then.
     
  21. thread starter macrumors member

    Joined:
    Oct 24, 2011
    #21
    It isn't really "unchanging" more than it was before i plugged it into the external screen really :(
     
  22. thread starter macrumors member

    Joined:
    Oct 24, 2011
    #22
    But what could course it to use so much more than it should?
     
  23. macrumors member

    Joined:
    Apr 3, 2011
    #23
    If you're concerned about your battery, MBP batteries are very cheap. If you don't feel like replacing the machine altogether because you think it's a defect with your laptop, I would just buy a new battery, or see what's eating it up like that and decide if you need a new one.
     
  24. thread starter macrumors member

    Joined:
    Oct 24, 2011
    #24
    If somethings wrong with the machine or the battery, I would get it replaced by Apple, wouldn't I? I just bought it the 8th this month.
     
  25. macrumors 6502a

    TheIguana

    Joined:
    Sep 26, 2004
    Location:
    Canada
    #25
    I believe the point was that playing video uses a lot more processing power than word processing.

    The MBP battery life times are not based on watching 7 hours of video, rather they are based on minimal use situations such as word processing.
     

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