Does keeping your macbook plugged in lose overall battery capacity?

Discussion in 'MacBook Pro' started by hatcher146, Nov 11, 2007.

  1. hatcher146 macrumors 6502

    Joined:
    Mar 26, 2007
    Location:
    north carolina
    #1
    for the past month i think i've kept my macbook plugged into the wall. and the battery meter now says 95% but it says fully charged...and the green light is on? is keeping it plugged in hurting my overall charge?

    thanks
     
  2. JNB macrumors 604

    JNB

    Joined:
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    In a Hell predominately of my own making
    #2
    No, as the charging circuit should bypass the battery when it's fully charged. Just condition the battery periodically and you'll be fine. In fact, it may even get better!

    My max capacity in mAh has been increasing steadily!
     

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  3. anirban macrumors 6502a

    anirban

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    Jan 9, 2007
    Location:
    Houston, TX
    #3
    You've owned the machine for 7 months, and have had only 5 cycles!?

    I've owned mine for 5 months, and already have over 40 on it.
     
  4. TheStu macrumors 65816

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    Carlisle, PA
    #4
    14 months, 240+ cycles (Student, ergo unplugged A LOT!)
     
  5. CalBoy macrumors 604

    CalBoy

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    May 21, 2007
    #5
    What you're seeing is battery protection in action. Your battery will not charge if the charge was above 95% at the time you began a charge. As the battery gradually looses its charge over the course of a couple days, 100% become 99%, 98%, etc, after days and weeks. If your battery dips below 95%, it will charge back up to 100% again, and you'll see the red light come back on. :)
     
  6. theman macrumors 6502a

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    Jul 26, 2007
    #6
    I finally got a MBP that doesn't have the yellow screen, but unfortunately it shipped with a batter that only has 96% life. Hasn't changed at all. I can still get over 5 hours life if i have everything turned down/off. So that's fine.
     
  7. michail macrumors member

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    Nov 2, 2007
    #7
    What are the best tips for periodically conditioning the battery?
     
  8. CalBoy macrumors 604

    CalBoy

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    May 21, 2007
    #8
  9. JNB macrumors 604

    JNB

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    #9
    I keep it on AC nearly all the time; I do a conditioning about every six weeks. I'm either at home or in a hotel or a client site. I really don't do much "untethered."

    ^^ To the OP: What he said.
     
  10. skyrider007 macrumors 65816

    skyrider007

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  11. marclapierre13 macrumors 6502a

    marclapierre13

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    #11
    Sweet, i was wondering how to condition a battery as well... Ill have ot go through that when I go home. Even thoguh my MBP is less than a month old.
     
  12. CalBoy macrumors 604

    CalBoy

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    May 21, 2007
    #12
    Haha...I put a lot of time working on that guide, so I'm ensuring that people read it:p
     
  13. Bearxor macrumors 6502a

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    Jun 7, 2007
    #13
    6 Months - 4 Cycles :p
     
  14. peapody macrumors 68040

    peapody

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  15. peapody macrumors 68040

    peapody

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    Location:
    baltimore, md
    #15
    When they say condition the battery, it just means to let the computer run on battery until the power shuts off and then recharge it right? How do you have 5 cycles when you regularly condition? :confused:
     
  16. skye12 macrumors 65816

    skye12

    Joined:
    Nov 11, 2006
    Location:
    Austin, Tx
    #16
    ibook 4 years old-original battery still good although its been plugged
    in 99% of the time.
     
  17. CalBoy macrumors 604

    CalBoy

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    May 21, 2007
    #17
    Intel models (macbook+macbook pro) require a 5 hour rest period in which the computer cannot be plugged in. This is 5 hours after the battery has "died." This is to ensure that the battery has really run out of power, as the macbook and macbook pro keep some reserve power.


    As for his 5 to 7 discrepancy, he might have forgotten one or two. ;)
     
  18. portuglish08 macrumors member

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    Sep 25, 2007
  19. CalBoy macrumors 604

    CalBoy

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    May 21, 2007
    #19
    Have you calibrated? What software are you using to measure this? Is it Coconut? Is it a refurbed notebook? Details, details, details!:p
     
  20. lampdeskchair macrumors member

    Joined:
    Jul 26, 2007
    #20
    3 months and 110 cycles, I think I got you beat. (time/cycles)

    -with 100% battery health according to istat and I get slightly longer battery life then when I first bought my Macbook.

    I am using my Macbook every day for at least 4-5 hours a day sometimes double that. Hell even right now I'm watching a movie in the livingroom with my dad and doing some work on it while on the couch.

    I love notebooks. :D
     
  21. Dybbuk macrumors 6502a

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    Aug 8, 2006
    #21
    I would say no. I use mine plugged in most of the time and it's still at 100%.
     
  22. anirban macrumors 6502a

    anirban

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    Jan 9, 2007
    Location:
    Houston, TX
    #22
    Since we are comparing cycles, I have heard that Apple voids the warranty on a battery after 300 cycles. Can anyone confirm that? I guess it is understandable considering 300 cycles, but I just want to be sure.
     
  23. Analbarbiturate macrumors member

    Joined:
    May 20, 2007
    Location:
    Land of the Lost
    #23
    What everyone wrote is true. It's normal for a plugged battery to read at say 95%.

    It's also far from the norm to keep a laptop plugged in 100% of the time.

    You are doing nothing wrong.

    With anything battery charged, it's good to run the battery down all the way and then charge it without use once in a while.

    I can't brag on cycles because I feel the more cycles the harder to sell my laptop in the future. I don't want to buy a laptop with 1000 cycles. This means the laptop has been "around".

    It just makes sense. I'm low on that point and plan on keeping it low based on school and work conditions.
     
  24. future macnerd macrumors member

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    Aug 1, 2007
  25. marclapierre13 macrumors 6502a

    marclapierre13

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    Jul 7, 2005
    #25
    Questions:

    What is calibrating a battery, and how?
    What is the best software for an intel C2D Leopard to test the battery etc?


    My battery has never died on me. I have had it go on reserve battery power 3 times though before I charged it.
    I get about 2 hours battery life with BT on, brightness on full, and running about 5 apps on average (itunes, msn, imail, safari, etc)
     

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