battery-time and cores

Discussion in 'MacBook Pro' started by sir. mac, Nov 21, 2006.

  1. sir. mac macrumors regular

    Nov 21, 2006
    As I travel extensively battery-life is a big issue for me. So far I´m really pleased with the performance of my 2 week old MBP C2D, which lasts me nearly 4 hours of video (not DVD). I did the battery-calibration and always let it run to empty if I disconnect the power-supply. Anyway, I´ve been trying to monitor the cpu speed with the somewhat unreliable CoreduoTemp, and noticed that it would stay at 2.ghz, even though settings set to "maximum battery life". I don´t know if this reading is correct, but is there a way to throttle down cpu-speed and make it constant at a specific level?

    I also read somewhere that you could manually set the number of active cores (in the devtools?). How then do I set it to only one active core, and would this at all impact battery-time?
  2. flalaw macrumors regular

    Aug 11, 2006
    United States
    if you want to maximize your battery life, don't let your battery run to empty every time you use it. your battery has only a set number of charge cycles in its life. so if you run it down lets say 10 percent, then charge it back up, you've only used 1/10th of a charge cycle.

    read this for more info:
  3. sir. mac thread starter macrumors regular

    Nov 21, 2006
    thanks. I remember reading about this, but forgot it!

    But what about the cores?
  4. sir. mac thread starter macrumors regular

    Nov 21, 2006
  5. ChickenSwartz macrumors 6502a

    Jul 27, 2006
    Any idea how many cycles a MBP's battery can take before it starts to diminish, to let's say, 80% of the original life?
  6. sir. mac thread starter macrumors regular

    Nov 21, 2006
    As I´ve lost 1% after 8 cycles I would say 160 before 80%, but that number seems a bit short.

    Read somewhere that one should let the battery go down to 40% before charging it, as this would be easier on the cycle numbers. After I read it the guide was removed so I don´t know if this was because it´s just wrong or what. The Apple-pages on battery-care doesn´t mention this though.

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