Typical battery drainage when off?

Discussion in 'MacBook Pro' started by junkster, Jan 30, 2007.

  1. junkster macrumors regular

    Joined:
    Nov 6, 2006
    #1
    I have a MB C2D. If the battery is fully charged and I don't use the MB for 2-3 days (turned off, not sleeping!), when I next use it I get a "20 minutes until battery is charged" indication The 20 varies quite a bit.

    Is it normal to lose significant charge after 2-3 days of having the MB turned off? I know batteries do drain, but I always thought it would take weeks of being turned off to really matter.
     
  2. iSee macrumors 68040

    iSee

    Joined:
    Oct 25, 2004
    #2
    I think that sounds about right.

    Rechargeable batteries (like the one in your computer) self-discharge a lot quicker than disposables. I'm not sure, but it is around 3% a day. And, for Macs, the barrery recharge rate is fast for the first 80% of the capacity of the battery (~2 hrs?) and then slower for the last 20%. The amount of discharge for you is in that last 20%. So 20 mintues to recharge about 9% of your battery might be about right.
     
  3. flopticalcube macrumors G4

    flopticalcube

    Joined:
    Sep 7, 2006
    Location:
    In the velcro closure of America's Hat
    #3
    The next time you recalibrate your battery, keep an eye on the time and the percentage charge.
     
  4. extraextra macrumors 68000

    extraextra

    Joined:
    Jun 29, 2006
    Location:
    California
    #4
    I think it also depends on external factors like heat. When my room is cold my iBook loses it's charge quicker than if it's warm. (Like, winter/summer)
     

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