MacBook Pro battery failing

Discussion in 'MacBook Pro' started by mrblu, Jul 14, 2008.

  1. mrblu macrumors newbie

    Sep 19, 2007
    After several times of my MBP shutting down without warning, and while the battery indicates a charge of 83-85%, I did some checking.

    Here is what the computer says:

    Battery Information:

    Model Information:
    Serial Number: Sony-ASMB012-3734-9d57
    Manufacturer: Sony
    Device name: ASMB012
    Pack Lot Code: 0003
    PCB Lot Code: 0000
    Firmware Version: 102a
    Hardware Revision: 0500
    Cell Revision: 0303
    Charge Information:
    Charge remaining (mAh): 3966
    Fully charged: No
    Charging: Yes
    Full charge capacity (mAh): 4699
    Health Information:
    Cycle count: 63
    Condition: Good
    Battery Installed: Yes
    Amperage (mA): 1501
    Voltage (mV): 12421

    Coconut confirms these figures.

    I tested it this way: when the battery indicator reads 99%, the mag safe light turns green. The battery icon says fully charged. I unplug the mag safe, and continue surfing. After about twenty minutes the computer shuts off - NO warning. Just before it dies, the battery meter says 83-85% charge remaining.

    So basically, I can only use about 15% of the battery's capacity.

    My usage is mixed - I'll have it plugged in for several hours a day, but also use it un-plugged to 'exercise' the battery.

    I've tried to calibrate it but when it shuts off at an indicated 83-85%, its hard to 'drain' the battery.

    Any suggestions before I try to get this battery replaced?

  2. davegoody macrumors 6502


    Apr 9, 2003
    Reading, Berkshire, England
    Incredible !

    I have EXACTLY the same problem with my MacBook Pro 17" - 2.33Ghz

    It DOES restart though, on battery, when the power button is pressed (cold start) - and then runs OK 'til the end.

    I will get mine swapped out under AppleCare, if yours is under warranty still I would do the same.


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