Short Battery Lifetime - Need Replacement?

Discussion in 'Macintosh Computers' started by Mac Lad, May 4, 2005.

  1. Mac Lad macrumors member

    Joined:
    Sep 25, 2004
    Location:
    Big Easy, Louisiana
    #1
    Hello all,

    So here is the story... I usually get about 1-2 hrs (or 2hr and 40 min if I'm lucky) of battery power on my 1 GHz 12" Powerbook. However, since it's almost at the end of semester, I've been running lots of processor-intensive applications for the 2 past weeks (like Matlab). And now, the battery lifetime is only for about 20-30 minutes ... Does this mean that I have to replace the battery?? If yes, do I have to get one from Apple's website or any other brand from ebay will suffice??

    Thanx a lot for the help!!!....
     
  2. WildCowboy Administrator/Editor

    WildCowboy

    Staff Member

    Joined:
    Jan 20, 2005
    #2
    Open Terminal, make the window wide, and type the following:

    ioreg -l | grep -i IOBatteryInfo

    There you'll see your battery's current capacity (first item) and the absolute max capacity (last item). For instance, my three-month-old PB has a capacity of 4311 and a max capacity of 4400...I'm good. I have a four-year-old iBook whose capacity is 161 with a max capacity of 4000...I get 5 minutes of battery life on that one. :D
     
  3. Mac Lad thread starter macrumors member

    Joined:
    Sep 25, 2004
    Location:
    Big Easy, Louisiana
    #3
    Hmm... thanx for the tips WildCowboy, my battery's capacity is 397 while the absolute maximum capacity is 4200. I guess it's time to change the battery :cool:
     
  4. mkrishnan Moderator emeritus

    mkrishnan

    Joined:
    Jan 9, 2004
    Location:
    Grand Rapids, MI, USA
    #4
    What is the number listed under "cycles"? Unless this number (a rough count of how many charge cycles you've used) is in the 300s or higher, I would seriously recommend you go through the conditioning/calibrating procedure first (charge to full, drain all the way until it *sleeps*, then plug in immediately, unsleep it and let it charge). I would advise doing that at least once and then doing the ioreg thing again.

    After about 100 cycles, and 17 months, I am at 3500 out of 4400 on my iBook 12".
     
  5. Mac Lad thread starter macrumors member

    Joined:
    Sep 25, 2004
    Location:
    Big Easy, Louisiana
  6. mkrishnan Moderator emeritus

    mkrishnan

    Joined:
    Jan 9, 2004
    Location:
    Grand Rapids, MI, USA
    #6
    Yeah, that's approximately at the upper end of what you can expect from a notebook battery. :(
     
  7. tekmoe macrumors 68000

    Joined:
    Feb 12, 2005
    #7
    wild cowboy, that is an AWESOME command!@$

    Do you have any other sweet commands like that???
     
  8. iBunny macrumors 65816

    Joined:
    Apr 15, 2004
    #8
    How long should one of these notbook batteries last?
     
  9. mkrishnan Moderator emeritus

    mkrishnan

    Joined:
    Jan 9, 2004
    Location:
    Grand Rapids, MI, USA
    #9
    300-350 cycles, with a cycle defined as a full recharge and discharge...if you use it halfway and recharge twice, it should be one cycle, in principle.
     
  10. WildCowboy Administrator/Editor

    WildCowboy

    Staff Member

    Joined:
    Jan 20, 2005
    #10
    My dead iBook battery (referenced above) only has 128 cycles on it, but then again, it's also four years old. So don't go just by the number of cycles; it's a combination of time and cycles.

    And no, I don't really have any more of those great commands, though you certainly can do a lot with Terminal. I get just about all of my info from these forums...I just happen to be able to remember it and spit it back out when someone asks about it. :D
     

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