MacBook battery amperage?

Discussion in 'Mac Pro' started by iamhammill, Jun 11, 2006.

  1. iamhammill macrumors 6502

    iamhammill

    Joined:
    Feb 20, 2006
    Location:
    York, PA
    #1
    Can someone please check in system profiler to see what their battery amperage is. It's under the power tab.


    I think this might be the cause of my shutdowns.


    Thank you.

    [​IMG]
     
  2. Josias macrumors 68000

    Josias

    Joined:
    Mar 10, 2006
    #2
    Full capacity (mAh): 5192
    Remaining capacity (mAh): 5158
    Voltage (mV): 12548
    Cycles: 3

    See MB specs in sig.
     
  3. iamhammill thread starter macrumors 6502

    iamhammill

    Joined:
    Feb 20, 2006
    Location:
    York, PA
    #3

    Thank you, but I'm most concerned with the battery amperage. What is the number on that?
     
  4. Josias macrumors 68000

    Josias

    Joined:
    Mar 10, 2006
    #4
    -30 mAh (it is plugged in now)
     
  5. Rovman macrumors regular

    Joined:
    May 4, 2006
    Location:
    United Kingdom
    #5
    Battery Information:

    Battery Installed: Yes
    First low level warning: No
    Full Charge Capacity (mAh): 5136
    Remaining Capacity (mAh): 5105
    Amperage (mA): -1134
    Voltage (mV): 12393
    Cycle Count: 18


    Based on your Full charge capacity, it is my guess that you didn't do the Battery Calibration.
     
  6. Mord macrumors G4

    Mord

    Joined:
    Aug 24, 2003
    Location:
    UK
    #6
    Battery Installed: Yes
    First low level warning: No
    Full Charge Capacity (mAh): 5083
    Remaining Capacity (mAh): 2645
    Amperage (mA): -1871
    Voltage (mV): 11314
    Cycle Count: 21

    yes yes i've had it for a week and a half and i've completely hammered the battery.
     
  7. iamhammill thread starter macrumors 6502

    iamhammill

    Joined:
    Feb 20, 2006
    Location:
    York, PA
    #7


    Hmm I calibrated it the first day. Must have done something wrong.


    I started the thread becuase my MacBook is randomly shutting down, and I read one user on the Apple forums say his problem was fixed with a new battery.
     
  8. Rovman macrumors regular

    Joined:
    May 4, 2006
    Location:
    United Kingdom
    #8
    Maybe the battery is faulty, or you did something wrong. Either way your full capacity is pretty low for a brand new battery. Maybe you should try calibrating again.
     
  9. iamhammill thread starter macrumors 6502

    iamhammill

    Joined:
    Feb 20, 2006
    Location:
    York, PA
    #9
    I suppose I could give it a try.


    Anyone know what causes the difference in amperage?
     
  10. jsw Moderator emeritus

    jsw

    Joined:
    Mar 16, 2004
    Location:
    Andover, MA
    #10
    I'm pretty sure all that (the negative number) means is that you're discharging the battery (i.e., it isn't plugged in).

    The fact that the capacity is so low so soon does possibly indicate a bad battery, though.
     
  11. wxboss macrumors member

    wxboss

    Joined:
    May 13, 2006
    Location:
    Jax, FL
    #11
    Yes, the battery could be bad. You may want to try reseting the PRAM and try another calibration. The proper way to calibrate is:
    Charge MB to 100%;
    Disconnect power and allow battery to run all the way down (disregard low battery warning) and let MB put itself in a low battery induced Sleep;
    Let it stay in this state for 5 or more hours - just let it sit with an empty battery;
    After 5 hours, connect power and charge it all the way to 100%.
     
  12. Rovman macrumors regular

    Joined:
    May 4, 2006
    Location:
    United Kingdom
    #12
    Minor correction, once charged to 100%, leave it powered on and Plugged in for a further 2 hours before you start the discharge.
     
  13. wxboss macrumors member

    wxboss

    Joined:
    May 13, 2006
    Location:
    Jax, FL
    #13
    You're right! Good catch :)

    My apologies for leaving that out.
     

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