battery health starting at 98%?

Discussion in 'MacBook Pro' started by ct04, Mar 9, 2008.

  1. ct04 macrumors member

    Joined:
    Feb 28, 2008
    #1
    Hi guys,

    So I got my new mbp on Tuesday, but when I installed iStat, it told me my battery health was already at 98%. Normal? Should I take it in and get the battery replaced?

    Thanks!
     
  2. xUKHCx Administrator emeritus

    xUKHCx

    Joined:
    Jan 15, 2006
    Location:
    The Kop
    #2
    Try calibrating your battery

     
  3. markrivers macrumors 6502a

    markrivers

    Joined:
    Feb 9, 2008
    Location:
    Valencia, California
    #3
    same here, got my MBP last friday and the battery started at 98% health.
    used it on batteries for 7 cycles now and it's at 97%.

    i wonder if there's anyone with a 100% health out there.
    know people who have 100% while on AC but when they start using batttery, it quickly drains, and the mbp shuts off at 20% without warning.

    mine, shuts off around 5% and i get a warning before it goes to sleep:)
     
  4. Ibjr macrumors 6502a

    Joined:
    Jun 29, 2002
    Location:
    Eastern seaboard
    #4
    i had that happen with my macbook. I tried to calibrate it and it is at 96% with 30 cycles.... It is funny considering it replaced a bad battery.
     
  5. Winglet macrumors regular

    Winglet

    Joined:
    Dec 16, 2007
    Location:
    Upstate, NY
    #5
    iStat issues just for your information

    Just so you are aware, several of us MBP owners who installed iStat were having serious MBP sleep problems. The computer would not awaken from sleep and you would have to do a hard reboot.

    One MacRumors member figured out the iStat connection and had some suggestions. Here is a link to that post:

    http://forums.macrumors.com/showthread.php?t=441089&highlight=istat

    I have a machine that is 4 months old and has 98-99% batter life with 27 cycles. I have installed Leopard Cache Cleaner which has a feature that will tell you the battery health. You may want to check it out too!

    Good luck with your new MBP:apple:
     
  6. Watabou macrumors 68040

    Watabou

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    Feb 10, 2008
    Location:
    United States
    #6
    I had started from 98% too. I calibrated my battery yesterday. Today it says 100% battery health so that really helped.
     
  7. MacDann macrumors 6502a

    MacDann

    Joined:
    Mar 27, 2007
    Location:
    Can see the end of the Earth from here
    #7
    I have found that it often takes a couple of cycles after it's been recalibrated before things start to look right again.

    And keep in mind - you're not recalibrating the battery, you're recalibrating the hardware and software that's tracking battery performance.

    MacDann
     
  8. Eraserhead macrumors G4

    Eraserhead

    Joined:
    Nov 3, 2005
    Location:
    UK
    #8
    I wouldn't worry about it. 80%/300 cycles is the cutoff. i.e. if you battery is less than 80% health at less than 300 cycles you can get a new one for free, as long as its within the warranty. Of course 79% at 299 cycles is taking the piss a bit.

    It also fluctuates a few percentage points each time its charged.
     
  9. Winglet macrumors regular

    Winglet

    Joined:
    Dec 16, 2007
    Location:
    Upstate, NY
    #9
    I have calibrated my batter monthly, like suggested, and still only shows a maximum of 99% battery health.

    From what I have read, the 99% is good as many see a much steeper drop in health much sooner.

    The price to pay for a battery powered portable computer I guess!
     
  10. Watabou macrumors 68040

    Watabou

    Joined:
    Feb 10, 2008
    Location:
    United States
    #10
    Mine is back to 99%. :(

    Oh well. I have 5 cycles on my battery. But I plan on keeping it plugged it to save me some cycles.
     
  11. techguy40 macrumors regular

    Joined:
    Mar 1, 2008
    #11
    how you check how many cycles you have?

    What is consider a cycle?
     
  12. markrivers macrumors 6502a

    markrivers

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    Feb 9, 2008
    Location:
    Valencia, California
    #13
    is there anyone out there who still has 100% health?
     
  13. fs454 macrumors 65816

    Joined:
    Dec 7, 2007
    Location:
    Los Angeles / Boston
    #14
    I've got 177 cycles and 89% health. I'm assuming this is good for where i'm at?

    It always bumps down to like 83% and then back up to 89, so I'm not really sure what to believe.
     
  14. markrivers macrumors 6502a

    markrivers

    Joined:
    Feb 9, 2008
    Location:
    Valencia, California
    #15
    that's look ok to me.
    how long did it took you to have 177 cycles?
    i'm always on Ac even when i'm out.
    but every month i try to use the battery
     
  15. fs454 macrumors 65816

    Joined:
    Dec 7, 2007
    Location:
    Los Angeles / Boston
    #16
    Its about 8 months old, so I figure i'm on the right track. I do, or did use the battery quite frequently.
     
  16. neski macrumors member

    Joined:
    Aug 24, 2007
    #17
    ok i know this is not the right laptop for this post but my ibook g4 has 460 cycles and its still at 88%.i got istat and thats what its telling me.that sounds like it could be wrong after all these charges.
     
  17. TraustiB macrumors member

    Joined:
    Nov 27, 2007
    Location:
    Reykjavík, Iceland
    #18
    That sound pretty good to me. I'm personally on 60% after 108 cycles, which worries me a bit.

    A friend of mine has a white MB a year old, with 279 cycles at 100% and that scares me :p
     
  18. markrivers macrumors 6502a

    markrivers

    Joined:
    Feb 9, 2008
    Location:
    Valencia, California
    #19
    try using your ibook with the battery,
    how many hours do you still have until it goes to sleep
     
  19. notatrumpetpro macrumors member

    Joined:
    Feb 19, 2008
    #20
    my new base penryn has 3 cycles and is at 97% battery health :-/. I have calibrated with no luck.

    so is there nothing to do? is 97% normal for a 2 day old mbp?
     
  20. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #21
    Mine came at 97% and after 12 it was up to 99%, now it's back down to 97%
     
  21. neski macrumors member

    Joined:
    Aug 24, 2007
    #22
    its about 2-2.5 hours. thats using the battery.
     
  22. markrivers macrumors 6502a

    markrivers

    Joined:
    Feb 9, 2008
    Location:
    Valencia, California
    #23
    decent amount. i'd say it's going to last you a few months more.
     
  23. TraustiB macrumors member

    Joined:
    Nov 27, 2007
    Location:
    Reykjavík, Iceland
    #24
    Went and got a new battery yesterday. Turns out it was defective and one of those batteries Apple did a recall on last year.

    New battery no questions asked. The battery runs now at 99% after 2 cycles. It moves from 99% - 100% couple times a day.
     
  24. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #25
    Really a recall battery?

    I guess I'm going to have to check my battery too then.
     

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