1 2 Previous Next 22 Replies Latest reply: Jan 16, 2009 8:54 PM by Matt Chach Go to original post
  • 15. Re: MacBook Pro Battery - When should I replace my battery.
    radvet Level 1 Level 1 (0 points)
    My macbook pro is 2-3 years old. My battery takes a while to charge and then once charged will only last 40 minutes.
    I looked at the power info and under health info, it only has 112 cycles, but under condition it says check battery. When I turn the computer over and push the battery button, all lights are illuminated. When I unplug the computer the computer indicates it only has 68 minutes of charge.
    I reset the SMC, but that did not help.
    Do I need to replace the battery?
    Thanks to anyone with suggestions
  • 16. Re: MacBook Pro Battery - When should I replace my battery.
    jlocalled Level 1 Level 1 (20 points)
    Check your Full Charge Amperage under Battery in System Profiler. If its under 80% of the original capacity of the battery, get it replaced. ( contact Apple or buy a new one )
  • 17. Re: MacBook Pro Battery - When should I replace my battery.
    radvet Level 1 Level 1 (0 points)
    This is what my computer says for the battery:
    Does this help?

    Model Information:
    Serial Number: Sony-ASMB012-3503-28af
    Manufacturer: Sony
    Device name: ASMB012
    Pack Lot Code: 0003
    PCB Lot Code: 0000
    Firmware Version: 102a
    Hardware Revision: 0400
    Cell Revision: 0303
    Charge Information:
    Charge remaining (mAh): 1878
    Fully charged: Yes
    Charging: No
    Full charge capacity (mAh): 1878
    Health Information:
    Cycle count: 112
    Condition: Check battery
    Battery Installed: Yes
    Amperage (mA): 0
    Voltage (mV): 12462
  • 18. Re: MacBook Pro Battery - When should I replace my battery.
    Julian Solomons Level 1 Level 1 (135 points)
    Looks like you have a very bad battery.

    Depending on your actual model and battery, you should have in excess of 5,000 mAh Full Charge Capacity. Yours is 1,800 - very weak. Mine died at 3,400.

    You only have 112 cycles, a reasonable life is certainly over 200, and maybe 300.

    I think you have a good case for a replacement - best bet to get this achieved is to go to a Genius bar in an Apple store and smile nicely!
  • 19. Re: MacBook Pro Battery - When should I replace my battery.
    radvet Level 1 Level 1 (0 points)
    Thanks for the info!
  • 20. Re: MacBook Pro Battery - When should I replace my battery.
    kellyandygators Level 1 Level 1 (0 points)
    I think I may have a bad battery. I have had it a little over 2 years now. I do have AppleCare and here are the stats for my battery:

    Battery Installed: Yes
    First low level warning: No
    Full Charge Capacity (mAh): 2292
    Remaining Capacity (mAh): 2148
    Amperage (mA): 591
    Voltage (mV): 12568
    Cycle Count: 301

    It seems that 300 is the magic number and I am going to be frustrated if I am over the limit by 1 or 2 cycles. Would having AppleCare make a difference in getting the battery replaced even though it may have just been through it's normal "life time"?
  • 21. Re: MacBook Pro Battery - When should I replace my battery.
    S.U. Level 6 Level 6 (8,360 points)
    Unfortunately, once you get to around 300 cycles, it's tough to make any kind of a case for a free replacement, whether or not you have Applecare, and especially after 2 years. You're at the point where your battery's performance would be expected to decline as the battery wears out. Sometimes people get lucky and their batteries last longer, but it's not something you can count on. I just don't think that Apple would be inclined to consider a battery that lasted for two years and 300 cycles to be defective.
  • 22. Re: MacBook Pro Battery - When should I replace my battery.
    Matt Chach Level 1 Level 1 (65 points)
    Does anyone know if having your computer plugged in most of the time diminishes the battery's ability to hold a charge?

    My battery/ computer is a year old. It has gone through only 40 cycles. I have been having trouble with the computer shutting off randomly after being unplugged for about 45 minutes to an hour.

    I called apple, they said to calibrate the battery, which I can't do since I can't deplete the battery. The computer shuts off after 45 minutes then won't turn on unless I plug it in.

    Earlier today my battery said it had 5330 capacity. Now all of a sudden it says 2259. I'm going to have to have a chat with apple again. I was just wondering if having it plugged in frequently could be the culprit. I do a lot of highly draining activities(video editing, watching dvd's, web video) so I am often tethered.
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