MacBook Battery questions about health and cycles.

Discussion in 'MacBook' started by SamIchi, Mar 30, 2009.

  1. SamIchi macrumors 68030

    SamIchi

    Joined:
    Aug 1, 2004
    #1
    My MacBook Battery has 32 cycles and 92% health, while my friend has 143 cycles, but 100% health, we both just calibrated. How does he still have 100% health on his?

    I alway keep my Macbook on, does that matter?
     
  2. NewMacbookPlz macrumors 68040

    NewMacbookPlz

    Joined:
    Sep 28, 2008
    #2
    If you're always plugged in, that can do it.

    If you drop below 80% and are still in warranty (with less than 300 cycles) you can try getting a new one c/o Apple.
     
  3. brop52 macrumors 68000

    brop52

    Joined:
    Feb 26, 2007
    Location:
    Michigan
    #3
    How old is your MB? Keep in mind that it loses charge overnight if not plugged in if you put it to sleep and that it stops charging when it gets to 100% and begins charging again at 95% even while plugged in (while in use).

    Not properly calibrating every 2-3 months will also kill a battery and only keeping it charging all the time.
     
  4. SamIchi thread starter macrumors 68030

    SamIchi

    Joined:
    Aug 1, 2004
    #4
    That was confusing, could you explain again.

    So should I sleep my MB at night? Will that help? Does it matter if I unplug or not?
     
  5. NewMacbookPlz macrumors 68040

    NewMacbookPlz

    Joined:
    Sep 28, 2008
    #5
    1) While in sleep mode, your computer uses some of the battery's charge if it's not plugged in.
    2) Once the charge state gets between 95-100% it will stop charging.
    3) Calibrate it monthly if you rarely use it unplugged, as constant plugged in can kill the battery as you're not "exercising" it.
     
  6. brop52 macrumors 68000

    brop52

    Joined:
    Feb 26, 2007
    Location:
    Michigan
    #6
    Lol sorry going back and reading what I wrote it wasn't that clear. My first question is how old is your battery? An old battery is an old battery even if you don't use it that much. Many fail after 2-3 years. You may have increased the aging process by not using it that much but we can't know as you haven't told us how old the machine is and which one it is.

    As the previous poster said, this is what I mean:
    1) The battery loses charge during the night if you have it asleep and not charging. (This is normal and you should keep it asleep if you plan to use it the next day. Also, you shouldn't really keep it charging all night)

    2) While in use, the machine slows its charging once it hits 95% in order to prevent overcharging. Then once it hits 100% it stops charging. When it gets down to 95% it begins charging again slowly and continues this cycle.

    3) Full calibration is important to exercise the battery and ensure that the battery is accurate in calculating capacity and time remaining. Not using the battery for an extended period can cause an early death of the battery. You should calibrate every 2 months or so.
     
  7. jmann macrumors 604

    jmann

    Joined:
    Dec 8, 2007
    Location:
    bump on a log in a hole in the bottom of the sea
    #7
    Don't worry so much about the battery, just use your computer and enjoy it like it's meant to be enjoyed. :)
     
  8. wizwaz3 macrumors 6502a

    wizwaz3

    Joined:
    Nov 4, 2006
    Location:
    Northern Arizona
    #8
    Hello,

    I don't mean to hi-jack or anything, but I thought I should refrain from opening a new thread.

    I just bought a white MacBook from Apple about 2 weeks ago. For about 1 week, my battery showed that it's 'health' was 100% (using iStat Nano), but now my battery only has 91% health. Do I have a faulty battery? It shows only 10 cycles on the battery. Also, is it best to use the battery until it warns and then plug it in, or should I keep it plugged in when I'm at home? Any help is appreciated!
     
  9. jmann macrumors 604

    jmann

    Joined:
    Dec 8, 2007
    Location:
    bump on a log in a hole in the bottom of the sea
    #10
    It's fine those programs aren't perfectly accurate anyway. Don't worry about it. :)
     
  10. keith1569 macrumors newbie

    Joined:
    May 17, 2009
    #11
    i agree with jmann..enjoy using ur macbook and dont worry to much about the battery :)
     
  11. wizwaz3 macrumors 6502a

    wizwaz3

    Joined:
    Nov 4, 2006
    Location:
    Northern Arizona
    #12
    Ok. I just thought it was strange losing almost 10% health in a week. Does Apple still manufacture new batteries or will I need to do a risky eBay search when it actually dies?
     
  12. pellets007 macrumors 6502a

    pellets007

    Joined:
    Jan 28, 2009
    Location:
    New York
    #13
    You can buy a new battery from Apple.
     
  13. Skeletal-dæmon macrumors 6502

    Joined:
    Apr 27, 2008
    #14
    Don't worry, in one day of heavy usage my battery went from 99 health to 87 health, then that night after doing a careful cycle it was back to 99 health again. It fluctuates depending on how you drain the battery, how you charge it up again, yada yada. I usually don't pay any attention to it at all.
     
  14. wizwaz3 macrumors 6502a

    wizwaz3

    Joined:
    Nov 4, 2006
    Location:
    Northern Arizona
    #15
    Wow... You're totally right! My battery say's 100% again! I've been leaving it on the charger most of the time and have only had it on battery power for 20-30 minutes. I won't worry too much anymore. Thank you all for easing my worries! =)
     
  15. Graygirl macrumors newbie

    Joined:
    May 15, 2008
    #16

    I've had my white Macbook 2.1 for just over 2 yrs. In that time I've never calibrated the battery. I didn't know I was supposed to do so. iStat tells me that my battery's health right now is 94% and has over 400 cycles (whatever that means!) I get a little over 2 hrs of battery time. If I'm supposed to calibrate, can you give me a link to find out how to do so? This is my first mac and I'm a little technologically challenged.
     
  16. shady825 macrumors 68000

    shady825

    Joined:
    Oct 8, 2008
    Location:
    Area 51
    #17
    Same here.. I used to freak out about it but now I just use it and dont worry.


    To the OP's original statement about it not being the same as his friends or whatever... Its a battery, no battery is going to have/hold/produce the same exact results even if the conditions are the same. Batteries fluctuate. You can see an example of this when people have new batteries and or a new MacBook, the full charge mAh will be different for every battery, even tho they are all "new" and "the same"
     
  17. shady825 macrumors 68000

    shady825

    Joined:
    Oct 8, 2008
    Location:
    Area 51
    #18
    Congrats on your first Mac.
    Google is your friend: http://support.apple.com/kb/HT1490
     
  18. brop52 macrumors 68000

    brop52

    Joined:
    Feb 26, 2007
    Location:
    Michigan
    #19
    As the previous poster posted:

    Charge fully and leave charged for two hours.

    Unplug the magsafe power, discharge fully (use your CPU to get it to discharge quicker with something like flash, turn the brightness up, turn on wifi, bluetooth, and IR), and leave discharged for at least 5 hours.

    Charge fully.
     

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