MBP Battery depletes during sleep - what is normal?

Discussion in 'MacBook Pro' started by peapody, Aug 6, 2008.

  1. peapody macrumors 68040

    peapody

    Joined:
    Oct 7, 2007
    Location:
    baltimore, md
    #1
    Hey guys,

    Just a question here. I did a search and didn't find anything too helpful.

    I let my mbp sleep overnight with 100% battery. I wanted to check how much of the battery depletes overnight when it is sleeping without the ac. I had 92% this morning. Is this normal?
     
  2. DeaconGraves macrumors 65816

    DeaconGraves

    Joined:
    Apr 25, 2007
    Location:
    Dallas, TX
    #2
    While I've never tried it myself, that certainly sounds normal. (How long was overnight? Six hours? Eight hours?)
     
  3. TEG macrumors 604

    TEG

    Joined:
    Jan 21, 2002
    Location:
    Langley, Washington
    #3
    Sounds OK, unless it was plugged into the wall.

    I would guess about 10% every 12 hours would be average.

    TEG
     
  4. merl1n macrumors 65816

    merl1n

    Joined:
    Mar 30, 2008
    Location:
    New Jersey, USA
    #4
    Yes this is normal. Even in sleep mode, the battery is being used to maintain what is in memory and PRAM (and flashes the sleep led), so when you wake the mbp, everything is restored as it was before sleep mode.
     
  5. mpw Guest

    Joined:
    Jun 18, 2004
    #5
    Yeah that sounds normal, I always assume about 1% per hour of sleep
     
  6. peapody thread starter macrumors 68040

    peapody

    Joined:
    Oct 7, 2007
    Location:
    baltimore, md
    #6
    Thanks guys,

    I guess I didn't think that it would deplete so much. I would think like maybe 4% at most or something.
     
  7. Zel macrumors regular

    Joined:
    Jul 7, 2007
    #7
    The numbers arent exact, they are measured by an analog voltimeter and translated into watt-hours by imperfect hardware. Dont go trying to compare a few percent here or there. You said you were expecting it to be about 96% and found 92% to be worth staring a thread over? Wow.
     

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