Battery question for the MacBook (late '09)

Discussion in 'Mac Basics and Help' started by Maclover564, Dec 28, 2009.

  1. Maclover564 macrumors newbie

    Joined:
    Dec 28, 2009
    #1
    I was reading this other topic and it said something like "battery health at 92% after 17 cycles." What does that mean? I looked at my iStat and it said mine is 99%health after 3 cycles. Is that good or bad?? How long do batteries usually last??
     
  2. -Ryan- macrumors 68000

    Joined:
    Jan 28, 2009
    #2
    That is good. :) Some people on this forum might try to claim otherwise, but there's no reason a battery can't last several thousand cycles (albeit being in bad condition at the end). After a couple of hundred cycles you'll start to notice the battery life being slightly shorter, but there shouldn't be any other problems.
     
  3. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #3
    There almost bi-daily threads about this:
    http://www.google.com/cse?cx=011016...e:forums.macrumors.com&hl=en&as_qdr=all&meta=

    Health is percent of original maximum capacity.
    If original capacity is 12000mAh and health is at 95%, then the current maximum battery capacity 11400mAh.
    Cycles are the complete discharge from 100% capacity to 0% capacity (not to be confused with maximum capacity, as 100% can be 12000mAh or 1200mAh after many, many cycles and 10% health).
    If you discharge (use the computer on battery), then one cycle can be added up by having five discharges from 100% to 80%, or two discharges from 100% to 50%, or one from 100% to 37% and one from 100% to 63%, and so on.

    There is also www.apple.com/batteries .
     
  4. harry*333 macrumors 6502a

    harry*333

    Joined:
    Jul 24, 2009
    #4
    somehow I've managed to keep my macbook(2006) at 98% with 483 cycles and I've only calibrated it once
     
  5. Jaro65 macrumors 68040

    Jaro65

    Joined:
    Mar 27, 2009
    Location:
    Seattle, WA
    #5
    Consider yourself lucky. I recently took my 15" MBP to Apple Store as the laptop was showing that my battery needs to be serviced after just barely under 50 cycles. Fortunately, I have AppleCare and so after doing some testing they just gave me a new battery.


    Good luck!
     

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