Random MBP Shutdown (on Battery)

Discussion in 'Mac Basics and Help' started by smartalic34, Dec 25, 2007.

  1. smartalic34 macrumors 6502a

    smartalic34

    Joined:
    May 16, 2006
    Location:
    USA
    #1
    As the title implies, my MBP shuts down while running on battery, but here's the catch: it is always around 30-35% remaining capacity that this occurs. I am running 10.5.1, and am using a battery about 6 months old (got it thru the MBP battery exchange program). I have attempted to re-calibrate the battery, but it never makes it below 31%.

    Any ideas? SMC reset didn't help...
     
  2. kajitox macrumors 6502a

    kajitox

    Joined:
    May 2, 2007
    #2
    Is this a system crash of sorts or is this just a random shutdown? I think usually the computers shut down after the battery gets below 10 minutes, but perhaps it's a certain percent. You might want to download coconutbattery and check your battery health.
     
  3. smartalic34 thread starter macrumors 6502a

    smartalic34

    Joined:
    May 16, 2006
    Location:
    USA
    #3
    the computer should be going to sleep, not shutting down. It is a random shutdown though, not a crash. My battery's health is 4390 mAh, whereas original capacity is 5500 mAh, so health is only 79%. even so, the LED lights are indicating there's charge left (and the indicator shows 31%).

    what's going on?
     
  4. kajitox macrumors 6502a

    kajitox

    Joined:
    May 2, 2007
    #4
    This is interesting; is the problem consistently happening when the battery is at a certain percent? If so, have you tried replicating the problem with someone else's battery? That might limit possible problems down.
     
  5. Verschoren macrumors regular

    Verschoren

    Joined:
    Apr 1, 2005
    Location:
    Antwerp, Belgium
    #5
    try restarting your Mac and do a P-Ram zap.

    My mom had the same problem, and after doing a PRam, the battery didn't show up as 25% full (in her case), but would appear as 0%
     
  6. Pili macrumors regular

    Joined:
    Nov 1, 2005
    Location:
    Orlando/Miami, FL
    #6
    Wirelessly posted (Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/Palm-D052; Blazer/4.5) 16;320x320)

    My dad's mbp is having the same problem but it sometimes completely shuts down within minutes of booting. I'm going to try and reset the pmu? when I get back home and see if that helps. Battery health is fine and its a 2.33ghz model.
     
  7. smartalic34 thread starter macrumors 6502a

    smartalic34

    Joined:
    May 16, 2006
    Location:
    USA
    #7
    I zapped the PRAM... and the MBP shut down when the battery was at 58%... so it has happened once at 31%, once at 35%, and now at 58%. My sister's MBP is currently getting a logic board replacement, so when it is shipped back, I'll test things with her battery and see if things change.

    I wonder what could be causing this?
     
  8. kjryan macrumors newbie

    Joined:
    Dec 26, 2007
    #8
    I'm having the same problem on my 2.16 CD MBP, and it just started a few days go- the battery gets somewhere between 30-50% and it just shuts down without a warning. I've tried zapping the PRam without any results.

    I saw two other people on the Apple discussion forums having the same problem, both within a few days ago too. Could this be from a recent update maybe?

    I might head over to the :apple: store soon to check things out.
     

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