Battery Life on my i7 13''

Discussion in 'MacBook Air' started by da3dl3us, Jul 21, 2011.

  1. macrumors member

    Joined:
    Jul 27, 2010
    #1
    So I charged my battery to 100% as per the battery calibration tools. It says amount of time left on my battery is 3hours and 30 mins. I haven't done anything to the system in terms of brightness, etc.

    Is this just because it hasn't been calibrated yet or is the battery life of the i7 really that poor?
     
  2. macrumors 65816

    Joined:
    Jun 14, 2010
    #2
    Check the CPU usage its probably running something at 75% or more...
     
  3. thread starter macrumors member

    Joined:
    Jul 27, 2010
    #3
    Nope. Around 10%.
     
  4. macrumors 65816

    fitshaced

    Joined:
    Jul 2, 2011
    #4
    My MBA 13 i5 says 8h 40. Not expecting to get that
     
  5. thread starter macrumors member

    Joined:
    Jul 27, 2010
    #5
    Damn, this is not good. I hope the battery life isn't crappy on this cpu. I'm gonna give it a shot with a proper calibration and see what happens.
     
  6. macrumors G4

    Joined:
    Oct 23, 2010
    #6
    The indicator can be notoriously unpredictable, especially at first. Once it has a chance to calibrate itself it should get better over time. By all means force a calibration if you want, but it's better to gauge battery life with a clock than by the display.
     
  7. macrumors regular

    Joined:
    Aug 4, 2005
    Location:
    Gothenburg, Sweden
    #7
    Of course it's not. The CPUs are physically the same. The only difference is that Intel has kept all cache enabled on the i7 and bumped the clock frequency by 100MHz. The effect on full load will be very small to negligible and the effect in idle should basically be nil.
     
  8. thread starter macrumors member

    Joined:
    Jul 27, 2010
    #8
    Ah, you're probably right, just got a bit nervous. I'm just going to let it calibrate itself and see how it is.
     
  9. macrumors regular

    Joined:
    Jul 14, 2010
    #9

    Just make sure the CPU isnt working hard. I'm interested to know the reported numbers also.. You sure got yours fast. I wish my was here.
     
  10. thread starter macrumors member

    Joined:
    Jul 27, 2010
    #10
    Picked it up in store. They had the ultimate 13'' in stock.
     
  11. macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #11
    The time indicated is an ever-changing estimate, based on the current power demands of your system, which is affected by a great number of factors, including screen brightness, WiFi, Bluetooth, apps/processes/widgets running, etc. This should answer most, if not all, of your battery questions:
     
  12. macrumors regular

    Joined:
    Jul 14, 2010
    #12
    They had the 1.8 i7 in store. Man I ordered mine online.
     
  13. macrumors 65816

    Joined:
    Jan 31, 2010
    #13
    I purchased mine in store.
     
  14. macrumors regular

    Joined:
    Jul 14, 2010
    #14
    Guess the only difference is 150 dollars if you want the gift card and the education discount. hmm wonder if I should cancel my order and go up to the store.
     
  15. macrumors 6502a

    Joined:
    Feb 3, 2011
    #15
    If you can, put the machine in idle, close all apps/windows, and wait about 15 seconds for the battery life indicator to update. This should give you the upper end of the range.

    The battery indicator will sometimes show battery life to be much lower than actually remaining, based on the instantaneous consumption of TurboBoost at that moment.
     
  16. macrumors 6502

    Joined:
    Jul 5, 2011
    #16
    The best way to test battery life is to record your current time and battery %. Use your laptop as how you normally use, for 30mins, then check your % again. You can get way more realistic battery life indication that way, though still not definite but enough to give you confident result.
     
  17. macrumors 6502a

    Joined:
    Jun 27, 2004
    #17
    I dunno - there were numerous reports of the battery life being worse in the 2.13Ghz C2D model than the 1.86Ghz C2D model. Despite those chips being physically the same. I even noticed that I'd get barely 5Hrs of use on the 2.13 and when I switched it for the 1.86 I'd get a good 7-8.

    I'm not saying the same will be the case here with the i5/i7 models, but it's certainly not unprecedented.
     
  18. macrumors 68030

    Joined:
    Apr 10, 2003
    Location:
    A hot desert
    #18
    Mine read that way too. 15 mins later it was at 6 hrs. We will see where it settles.
     

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