Battery issue I think?

Discussion in 'Mac Basics and Help' started by iburt, Aug 17, 2012.

  1. iburt macrumors newbie

    Joined:
    Aug 17, 2012
    #1
    I just bought a used MacBook. It's 40 months old. The battery has 36cycles. Max capacity was 4600 and it's down to around 3700.

    Now here's the issue when I unplug it as soon as the charge gets below 90% my capacity drops to only 1260 and I discharge quite fast? But as soon as I plug it back in and it gets above 90% my capacity goes back to normal?

    Thanks for any help.
     
  2. iburt thread starter macrumors newbie

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    Aug 17, 2012
  3. miles01110 macrumors Core

    miles01110

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    #4
    If it's over 3 years old regardless of the number of cycles the battery has passed its lifetime. Plus the evidence you've provided suggests a fault. Buy a new battery and be done with it.
     
  4. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #5
    You can try resetting the SMC, but you likely need a new battery.
    You should really have more cycles than that, if you want to keep the battery healthy. It's not good to leave it on AC power all the time.

    This should answer most, if not all, of your battery/charging questions:
     
  5. miles01110 macrumors Core

    miles01110

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    #6
    Actually 36 charges on a 40-month-old Macbook fits in pretty nicely with Apple's guidance.

    Your battery guide should be updated to reflect this instead of the "discharge every 2-3 days" statement you have in there now.
     
  6. jav6454, Aug 17, 2012
    Last edited by a moderator: Aug 18, 2012

    jav6454 macrumors P6

    jav6454

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    #7
    True. A battery that hasn't been put to use will go bust even faster.


    miles01110 nailed it pretty well. I bet you didn't even read what you post.
     
  7. GGJstudios, Aug 17, 2012
    Last edited by a moderator: Aug 18, 2012

    GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #8
    Actually, it shouldn't. Apple's statement is a minimum figure, stated completely here:
    For those using their battery on AC power, as opposed to someone saving a notebook for infrequent travel, AppleCare recommends the statement in the Battery FAQ.
     
  8. miles01110 macrumors Core

    miles01110

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    #9
    And if that minimum was actually bad for the battery it wouldn't be a minimum. :rolleyes: Stop spreading FUD please. The battery is nothing more than old.
     
  9. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #10
    It's not FUD. It was a recommendation and it's a valid one, whether you agree with it or not. I didn't say it was bad for the battery.
     
  10. samh macrumors 6502

    Joined:
    Oct 29, 2009
    #11
    It depends how those 36 cycles were acquired.

    Anyhow, if resetting the SMC doesn't work a new battery is in order. Batteries fail, it's just part of life with electronics.
     

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