Full Charge Capacity of new macbook pro battery!

Discussion in 'MacBook Pro' started by tworth23, May 23, 2010.

  1. tworth23 macrumors regular

    Joined:
    Feb 12, 2010
    #1
    Hello all,
    I received my new 15", i7, 128gb ssd, 8gb ram macbook pro on april 19th. I love it and have no problems. Have any of you guys noticed that the full charge battery capacity, which is found under system profiler-power, varies often. When I first got the macbook pro the full charge capacity of the battery was around 6830. Now with each charge it seems to go down slowly. At first it jumped from 6800 to 6600 and now stays at around 6520. Is this normal? Thanks in advance. Tried Mroogle with no results.......
     
  2. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #2
  3. tworth23 thread starter macrumors regular

    Joined:
    Feb 12, 2010
    #3
    @ggsstudios

    Your link does not answer my specific question.....thanks though. I am referring to why my battery capacity, jumped from 6800 to 6500mah.
     
  4. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #4
    Yes it does:
     
  5. tworth23 thread starter macrumors regular

    Joined:
    Feb 12, 2010
    #5
    battery health

    GGsstudios, I am not referring to battery health, percentage, that is displayed on istat pro, I am referring to the full charge capacity as shown in system profiler. Battery mah
     
  6. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #6
    It's the same thing, whether expressed as a percentage or mah. Battery full charge capacity = battery health. No matter how it's expressed, it will fluctuate over time, up and down.
     
  7. tworth23 thread starter macrumors regular

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    Feb 12, 2010
    #7
    ok, thanks...
     
  8. Thisiserdinc macrumors newbie

    Joined:
    Jun 16, 2011
    #8
    what about the expected numbers

    I am wondering what are the expected Full Charge Capacity (mAh) values of 15" Macbook Pro, just out of the box.
     
  9. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #9
    If you use iStat Pro, as recommended earlier, it will show you a percentage. You can use that with your mAh showing to determine the original full charge capacity. For example, if your System Profiler shows Full charge capacity (mAh): 6305 and iStat Pro shows 97% health, your full charge capacity was originally 6500 (6305 / 97%).
     
  10. Cging23 macrumors newbie

    Joined:
    May 20, 2010
    #10
    Do a battery calibration!

    I just got my late model 2011 macbook pro 15" i7. I was only getting around 1h30m of wireless browsing. I just did a battery calibration for the first time last night and mAh jumped from 6300 to 7035. As I am looking at the batter meter right now it say 95% remaining (8:22).
     
  11. sweetbrat macrumors 65816

    sweetbrat

    Joined:
    Jun 17, 2009
    Location:
    Redford, MI
    #11
    Battery calibration doesn't give you more mAh, it just makes the numbers that are being reported more accurate. The amount of time you get to use your MBP from a full charge varies greatly depending on what you're doing with the computer.
     
  12. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #12
    The built-in batteries in the newer Mac unibody notebooks come pre-calibrated and do not require regular calibration like the removable batteries.

    Also, calibration doesn't change your battery's health. It only makes your readings more accurate. Read the Battery FAQ in the 2nd post of this thread.
     

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