Every time my battery dies, my macbook resets to December 31, 2000...

Discussion in 'MacBook Pro' started by andyACEcandy, Mar 10, 2013.

  1. andyACEcandy macrumors 6502a

    Joined:
    Feb 11, 2008
    #1
    And I have to reset it back to the right time and date before I can get anything to function.

    What's this all about? Any fix? Thanks!

    It's a 2009 MacBook Pro for what it's worth
     
  2. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #2
    Don't let your battery drain all the way and it won't happen. It's not good for the battery to fully drain it frequently.

    The link below should answer most, if not all, of your battery/charging questions. If you haven't already done so, I highly recommend you take the time to read it.
     
  3. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #3
    That's normal.

    Your computer requires power to keep time, so it's best advised to turn it off before it reaches 0%.
     
  4. hackerwayne macrumors 6502a

    hackerwayne

    Joined:
    Feb 17, 2012
    Location:
    Kuala Lumpur, Malaysia
    #4
    don't let your battery drain till finish. Thats the fix.
     
  5. adjeff8 macrumors 6502

    adjeff8

    Joined:
    Nov 18, 2012
    #5
    My 2009 MacBook Pro does the same thing. I hear what you are all saying, don't let it drain to zero, but irregardless, isn't there supposed to be some kind of internal battery to prevent the date and time from resetting?
     
  6. andyACEcandy thread starter macrumors 6502a

    Joined:
    Feb 11, 2008
    #6
    Also, it was kinda weird... I got notified of low battery %, saw I had 15% then next thing I know, it powered down.

    Coconut battery says I have 57% remaining of my original battery. It's probably time for a new one, but yeah I thought there was an internal battery that kept the time from resetting
     
  7. maxosx macrumors 68020

    Joined:
    Dec 13, 2012
    Location:
    Southern California
    #7
    Windows laptops have a battery to keep the time & date maintained when the main battery is discharged.
     
  8. Toby Ziegler macrumors regular

    Toby Ziegler

    Joined:
    Mar 28, 2011
    Location:
    Gallifrey
    #8
    There's usually a button cell battery or capacitor on the motherboard that prevents the date & time along with other settings from being reset in the event that there's no other power available.

    It's not normal for that to happen, even if your battery hits zero.
     
  9. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #9
    While your battery shouldn't need calibrating, it wouldn't hurt to try it to see if your readings are more accurate. See the CALIBRATION section of the Battery FAQ I posted for instructions.
    There used to be a separate backup battery, but not anymore.
     
  10. jafingi macrumors 65816

    jafingi

    Joined:
    Apr 3, 2009
    Location:
    Denmark
    #10
    The CMOS battery is defective. You can replace it, or just stop draining the Macbook battery to 0% :)
     
  11. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #11
    There is no CMOS (PC) or PRAM (Apple) battery in the OP's MBP. See my last post.
     
  12. jafingi macrumors 65816

    jafingi

    Joined:
    Apr 3, 2009
    Location:
    Denmark
    #12
    Ohh! Didn't see it was a 2009 MBP :)
     
  13. cosmichobo macrumors 6502

    cosmichobo

    Joined:
    May 4, 2006
    #13
    To tag along here...

    My 2009 MacBook Pro 13" used take a snapshot, and go to sleep when the battery reached "critical"... And when you connected power, you needed to press the power button to wake the computer, and it would reload that snapshot, including the date/time.

    However recently this function is not being performed.

    Is that simply a sign of the battery's age? I was assuming it was the PRAM battery, until reading here that there is no PRAM battery in this model...

    Is or isn't there a capacitor that could be faulty?

    Where to flies go at night?

    cheers

    cosmic
     

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