Laptop loses charge quickly with cover closed

Discussion in 'MacBook Pro' started by mlevin77, Nov 13, 2010.

  1. mlevin77 macrumors newbie

    Joined:
    Nov 13, 2007
    #1
    I just bought a new MacBook Pro with a solid state (flash memory) disk. The battery life is good while I'm using it, but if I leave it with the cover off for a few days (asleep, I assume), it'll be mostly discharged when I open it up. I assume this isn't normal - it shouldn't be losing that much charge when closed and hybernating. I don't have "wake for ethernet access" checked, if that makes a difference. What's going on - why won't it hybernate?

    Mike
     
  2. snaky69 macrumors 603

    Joined:
    Mar 14, 2008
    #2
    A few days is enough to drain any laptop's battery down when asleep.

    When asleep the computer sends electricity to the RAM to keep whatever's on it.. well, on it. That way when you open it back up things are as you left them.

    The battery should be draining about 1% per hour. A rough guesstimate would be 3 to 4 full 24hour days to complete drainage on a full charge.
     
  3. sine-nomine macrumors regular

    Joined:
    Jul 25, 2007
    Location:
    Finer stores everywhere.
    #3
    Macs used to have much longer sleep times before the Intel switch. My old iBook could sleep for about a week and a half before the battery would be drained. Unfortunately, the Intel MacBooks I've used seem to last a few days tops. Wonder what they changed?
     
  4. w00t951 macrumors 68000

    w00t951

    Joined:
    Jan 6, 2009
    Location:
    Pittsburgh, PA
    #4
    I'm guessing its something with the new sleep system. Before, the contents of the disk were saved to active RAM, which remained powered on. Now, the contents are saved into the HDD and the computer powers off, allowing the removal of the battery during sleep. I'm not sure how this would decrease battery life (as it seems to be taking less power than the old sleep system) but that's the only idea I have. Well, Apple could have done something to the way the hardware manages power while the computer is at sleep. Other than that, the normal rate of decline for a battery appears to be about 1-2% per hour of sleep.
     
  5. zapro macrumors newbie

    Joined:
    Nov 21, 2010

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