Leaving the laptop plugged in bad for the battery?

Discussion in 'MacBook' started by ztk, Feb 7, 2010.

  1. ztk macrumors newbie

    Feb 7, 2010
    I've heard conflicting reports that leaving the laptop plugged lowers the battery life and that it is not true since it stops charging the battery.

    So is it bad to leave it plugged in all the time?
  2. spinnerlys Guest


    Sep 7, 2008
    forlod bygningen
    No. Why would Apple create notebooks with user-unreplaceable batteries?

    MRoogle will get you some results on this often asked question.
  3. DannySmurf macrumors 6502a

    Jul 7, 2005
    No, it's not bad for the battery. When you use the machine plugged in the battery is bypassed if it already has a full charge.

    Edit: Bit of a clarification.
  4. ztk thread starter macrumors newbie

    Feb 7, 2010
    Thanks, I did try using google but like I said I got people saying both things so I was unsure.
  5. lucy van pelt macrumors newbie

    lucy van pelt

    Feb 7, 2010
    thanks..., i had been wondering the same thing, i like to sit and work on my book with it plugged in.
  6. DannySmurf macrumors 6502a

    Jul 7, 2005
    Yeah, I do the same thing, and have never noticed any degradation because of that.
  7. student_trap macrumors 68000


    Mar 14, 2005
    'Ol Smokey, UK
    well thats really odd, because I have now had three macbook and pro batteries go bad because they have spent the vast majority of their life plugged in.

    I thought it was something to do with the laptop constantly charging to 100% and then letting off until it is about 97% before charging back up.
  8. testcard macrumors 68040


    Apr 13, 2009
    Northumbria, UK
    There's a good case for running the battery down completely once a month, and then giving it a full charge. Do a search for "battery calibration" or take a look here: http://support.apple.com/kb/HT1490
  9. savar macrumors 68000


    Jun 6, 2003
    District of Columbia
    Most laptop batteries require conditioning to maintain the life of the battery.

    Leaving it plugged in is only bad in the sense that over time the logic in the battery loses track of how much charge is left, so your battery will show low charge even when its not low. Conditioning helps the battery logic recalibrate.

  10. Anthonydrums macrumors newbie


    Feb 8, 2010
    I been using my mac for almost 1.5 years now. And the battery still functions perfectly. I don't think that it will lose it's power significally if i use it the way you described, even though i factor in that batteries do die at certain age...

    but then again i can just buy a new one...

    Don't worry too much

  11. miles01110 macrumors Core


    Jul 24, 2006
    The Ivory Tower (I'm not coming down)
    Yeah, most of them don't know what they're talking about though :-\ Seems to be a theme on the internet.
  12. Cottonsworth macrumors regular

    May 11, 2008
    My battery went weird after hardly using it over the years. Like others have suggested, I think giving the battery a regular workout would prolong the life. At least in theory.
  13. Sukia macrumors newbie

    Feb 2, 2010
    I have a PB G4 for 6 years. I never, never unplugged. Still charging at 97%.
    Not bad at all, i think.

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