Time to Replace Battery

Discussion in 'MacBook' started by ManhattanPrjct, May 17, 2009.

  1. ManhattanPrjct macrumors 6502

    Joined:
    Oct 6, 2008
    #1
    I routinely put my Macbook to sleep with a full-charge at night, then unplug it (the power cord doesn't reach where I keep my computer at night). When I wake it up, it generally has 93% of a charge left. This has never happened and I am wondering if it is time to replace the battery.

    Has this happened to everyone?
     
  2. pellets007 macrumors 6502a

    pellets007

    Joined:
    Jan 28, 2009
    Location:
    New York
    #2
    Calibrate your battery first. Your MacBook will stop charging at ~94%, but if I understand correctly, you're not charging it at night? It's wasting 7% for a ~12h sleep?
     
  3. r.j.s Moderator emeritus

    r.j.s

    Joined:
    Mar 7, 2007
    Location:
    Texas
    #3
    How old is it? How many cycles are on it?

    These are more important than a one-time occurrence like that. It may be that it woke up that night to run monthly scripts or something.
     
  4. VSMacOne macrumors 601

    VSMacOne

    Joined:
    Oct 18, 2008
    #4
    download coconutbattery and see what health percentage it gives you.
    If it's close to 100% you prolly don't need to spend the money on a new battery.

    And depending on how many hours you sleep, it's not abnormal for the MB to use up about 1% battery for every hours it stays asleep.
     
  5. ManhattanPrjct thread starter macrumors 6502

    Joined:
    Oct 6, 2008
    #5
    according to coconut battery, it says i have gone through 106 cycles and both meters are at 99%. i guess i need a calibration.

    just for my reference - how many cycles are these batteries good for?
     
  6. Buskape macrumors 6502

    Buskape

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    NGC 4889
    #6
    1000
     
  7. pellets007 macrumors 6502a

    pellets007

    Joined:
    Jan 28, 2009
    Location:
    New York
    #7
    I thought it was 800?
     
  8. andalusia macrumors 68030

    andalusia

    Joined:
    Apr 10, 2009
    Location:
    Manchester, UK
    #8
    It's a shame coconutBattery doesn't say 100+%...
     
  9. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #9
    300 Cycles is the pretty much the current threshold; many people will get a lot more than that; the newer batteries such as the ones in the 17" MBP are rated for up to 1000 cycles.
     
  10. testcard macrumors 68020

    testcard

    Joined:
    Apr 13, 2009
    Location:
    Middle England
    #10
    What constitutes a cycle? 0-100%; 50-100%; or simply "topping up" the battery for an hour?
     
  11. VSMacOne macrumors 601

    VSMacOne

    Joined:
    Oct 18, 2008
    #11
    0-100%, regardless of whether it's in increments or all together.
     
  12. bozz2006 macrumors 68030

    bozz2006

    Joined:
    Aug 24, 2007
    Location:
    Minnesota
    #12
    Are you sure? Or maybe I'm just misunderstanding what you're saying. I thought it was something like once it gets down below 70% or something, when you charge it back up, that constitutes a cycle.
     
  13. peepboon macrumors 6502

    peepboon

    Joined:
    Aug 30, 2008
    #13
    Calibrate it... mine generally pops back up to 100% after a calibrate
     
  14. Willis macrumors 68020

    Willis

    Joined:
    Apr 23, 2006
    Location:
    What feels like the middle of nowhere
    #14
    My Macbook battery is nearing 300 cycles, 97% health and I bought it December 2006.

    Only when it gets to about 60% health you might need to change it because they don't last for long at that state
     
  15. VSMacOne macrumors 601

    VSMacOne

    Joined:
    Oct 18, 2008
    #15
    As a safeguard, the battery will not recharge if it's above 95%. Anything below that, counts as charging, thus the battery keeps track of the percentage. Any time you charge your battery, whether it's 5% or 30%, it all adds up to 100% and that counts as a cycle.
     
  16. bozz2006 macrumors 68030

    bozz2006

    Joined:
    Aug 24, 2007
    Location:
    Minnesota
    #16
    I'm still not clear on what you're saying, when you mention increments and when you say it all adds up to 100%. do you mean, for example, that if you unplug the computer, then use it on battery until it goes down to 80%, then plug it back in, it won't count as a cycle until you've done this 5 (20% + 20% + 20% + 20% + 20% = 100%)times. I'm pretty sure that's not correct.
     
  17. flopticalcube macrumors G4

    flopticalcube

    Joined:
    Sep 7, 2006
    Location:
    In the velcro closure of America's Hat
    #17
    That is correct.

    http://support.apple.com/kb/HT1519

     
  18. peepboon macrumors 6502

    peepboon

    Joined:
    Aug 30, 2008
    #18
    Batteries are expensive, replace it only when its really needed :)
     
  19. bozz2006 macrumors 68030

    bozz2006

    Joined:
    Aug 24, 2007
    Location:
    Minnesota
  20. VSMacOne macrumors 601

    VSMacOne

    Joined:
    Oct 18, 2008
    #20
    Aren't we all at some point??! :p
     
  21. bozz2006 macrumors 68030

    bozz2006

    Joined:
    Aug 24, 2007
    Location:
    Minnesota

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