Need evidence that new mbp battery lasts 3x as long

Discussion in 'MacBook Pro' started by unagimiyagi, Jul 9, 2009.

  1. unagimiyagi macrumors 6502a

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    Jun 9, 2009
    #1
    Hi,
    what evidence is there to support this claim? I would like all the 17" unibody owners who have had this new battery the longest (about 8 months or so) chime in with their battery maH and/or health status.
    Is it still on the order of 97%?
     
  2. miles01110 macrumors Core

    miles01110

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    #2
    There will be no reliable statistics on this. The capacity and performance of batteries is generally not linear, and depends on many different factors (under the umbrella "how the battery is treated").
     
  3. cababah macrumors 68000

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  4. MacDawg macrumors P6

    MacDawg

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  5. miles01110 macrumors Core

    miles01110

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    #6
  6. NovemberWhiskey macrumors 68030

    NovemberWhiskey

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    May 18, 2009
    #7
    When I first used my MBP, my health was at 97% and showed 3 charge cycles. I only calibrated it once before using it.

    After 16 cycles, I am showing 99% health. It went up to 98 from 97, then back down to 97, and now it is at 99.

    It is only about 1-2 weeks old.

    I am getting about 5.5 hrs running VMware Fusion at 50% brightness settings and with the keyboard lighting turned off (light browsing, Onenote running on Vmware, Calender in spaces).

    When I turn VMware off, I see the battery estimated at 8+ hours initially at idle, but it never stays at that rating. It drops to about 6 hours after actually doing some stuff.

    I would say that if you are using it lightly, and with 50% brightness, the battery life is more like 6-7 hrs long.

    You may get 8 hours or more if you are only using it at 1-2 bars of brightness.
     
  7. ilfn143 macrumors 6502

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    #8
    go to the apple store, unplug the cord and wait... that's the best evident u gonna get
     
  8. cababah macrumors 68000

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    #9
    Glad to know I am not the only one that had my 13" MBP come with a couple charge cycles on it already.
     
  9. NovemberWhiskey macrumors 68030

    NovemberWhiskey

    Joined:
    May 18, 2009
    #10
    Yeah, I was wondering what was going on, but I guess they have to charge the computer at the factory and test it before it ships?

    I am not sure. I don't mind too much. It's like buying a brand-new car that has 10 miles on the clock. You want 0 miles, but what are you going to do? hehe. I don't think anything fishy was going on.
     
  10. cababah macrumors 68000

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    #11
    Yeah Apple offered to give me a new battery if I wanted but I decided it wasn't worth it. A few charge cycles out of 1000 is not a big deal to me and the battery still registered healthy after calibrating.

    Nobody would know otherwise unless they installed coconut battery...

    Factory testing I guess...but it varies for each person, I think I read one guy's post about having 15 charge cycles or something..I wonder how this whole factory testing thing works.
     
  11. upinflames900 macrumors 6502a

    upinflames900

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    May 20, 2009
    #12
    Sorry, I misunderstood...I think you may need some time for anyone to have some good data for you to compare then.
     
  12. Nocturnal22 macrumors 6502

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    Feb 23, 2009
    #13
    My new 13MBP the 1st one had 0 cycles then i got a replacment new one and that one have 0 cycles:D
     
  13. unagimiyagi thread starter macrumors 6502a

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    Jun 9, 2009
    #14
    It has been 7 months already since the first unibody 17" were released with this new technology. If a 'regular' battery wears down to 80% after a year (300 cycles), then after 7 months, there should be a noticeable drop to 90% battery health. If the newest unibody batteries are truly better, after 150 or 300 cycles the health should be 3 times better, or instead of having dropped 10%, should have only dropped 3.3 %.

    So If I see 150 cycles after 7 months on the 17" unibody and a battery health of 90%, that's not any better. If it is something like 96 or 97%, then I think there's truth to Apple's claims, assuming that the standard error of measuring battery health is small (in other words, 90% health is truly 90% health and couldn't actually be 95% health due to imprecise readings).
     
  14. miles01110 macrumors Core

    miles01110

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    #15
    This is not correct since decay curves are

    a) rarely linear
    b) different depending on battery use
     
  15. runciter macrumors newbie

    Joined:
    Mar 22, 2008
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    USA
    #16
    FWIW, Apple claims "The built-in battery in the new 13-, 15-, and 17-inch MacBook Pro is designed to retain up to 80% of its original capacity at up to 1000 full charge and discharge cycles." So that would be significantly better than the old 80/300.

    Source
     

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