battery life, macbook

Discussion in 'MacBook Pro' started by jbusc, Oct 26, 2006.

  1. jbusc macrumors member

    Joined:
    May 21, 2006
    #1
    I have a white 2ghz macbook, bought it early august I guess..

    I've been (loosely) tracking my battery life, both hours of usage as well as what coconutbattery reports..

    For the first month and a half or so, I would have around 5250mAh to 5300mAh capacity ("original" capacity, 5200mAh)

    Then, it dropped to about 5200mAh capacity after doing a monthly calibration, though the actual time the computer could operate actually went up, and held there a while.

    Now, though, in the past 2-3 weeks or so the battery life has dropped significantly, from 5175mAh down to about 4900mAh, along with a marked drop in actual battery life (about 45 minutes to an hour less)

    In recent days I have been busy at school draining it all the way until the battery indicator is red, then closing it up and recharging at home...this seems to contribute to the drop.

    I would recalibrate, except the deep draining process seems to be the problem. Any ideas? Is a drop of 275mAh in a span of 2 weeks normal?
     
  2. erikamsterdam macrumors regular

    erikamsterdam

    Joined:
    Apr 21, 2006
    Location:
    amsterdam
    #2
    Don't know what is "normal", but 1 thing is good to know about modern batteries: they don't have a "memory" effect anymore like old NiCads. So draining and recharging does not revive your battery, just wears it out.
    A normal Lion battery has a life of about 200 - 250 cycles of charging/discharging.
    The discharging that Apple recommends is only to learn the OS the new (lower) capacity of the battery.
     
  3. elppa macrumors 68040

    elppa

    Joined:
    Nov 26, 2003
    #3
    After a full charge mine is reading as 1:31 left, yet only a few months ago it was indicating 4-4 1/2 hours.

    It's gone from a current capacity of 5253mAh (85 battery load cycles) on the 6th October, to a a current charge of 4943mAh today (89 battery load cycles) (26th October).
     
  4. matt311rocks macrumors newbie

    Joined:
    Jul 8, 2006
    #4
    I'm down to 3025 max capacity after 100 cycles and 6 months on my white MacBook. Sometimes a full charge will tell me ~1:30 sometimes close to two hours. I hope this is not normal. I will probablly be calling applecare soon...

    Edit: I have done several battery calibrations and reset the PMU which helps little if none at all.
     
  5. jbusc thread starter macrumors member

    Joined:
    May 21, 2006
    #5
    mine is now 4849mAh (down from 4900mAh when I posted this, just yesterday)

    I think that if it continues dropping at this rate, I will call applecare and see what they have to say.

    (65 cycles and 4 months, if anyone is interested)
     
  6. shakerbaby macrumors regular

    Joined:
    Oct 5, 2006
  7. elppa macrumors 68040

    elppa

    Joined:
    Nov 26, 2003
    #8
    After a full charge - should the battery give you more than 1 hour 30 minutes?

    - Full Brightness
    - Bluetooth off
    - Airport off

    This is with a current capacity of 5005mAH (96% of original capacity (5200mAh)).

    I was getting a good 3-4 hours before - it's really plummeted in the last few week.s
     
  8. Grakkle macrumors 6502a

    Grakkle

    Joined:
    Oct 6, 2006
    Location:
    Earth
    #9

    Attached Files:

  9. elppa macrumors 68040

    elppa

    Joined:
    Nov 26, 2003
    #10
    It's £100 pounds for a new battery!

    What on earth are you paying for...

    A 13% drop in capacity means 2-3 hours drop in usage time.

    That's absurd.
     
  10. trapperjohn117 macrumors newbie

    Joined:
    Sep 13, 2006
    #11
    i keep mine plugged in most of the time but ive taken it for a couple of trips i still get around 2 1/2 hours a charge.

    [​IMG]
     

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