1 2 Previous Next 15 Replies Latest reply: Dec 20, 2011 8:10 PM by eww
Spenser Hukill Level 1 Level 1 (0 points)
Hello

I bought my MacBook Pro in late January of 2011. At first, the battery usually lased about 7 hours with a few applications running. But recently it has been lasting barely three hours with absolutely nothing running. Here are the specs from system profiler.

Model Information:

Serial Number: W00435H3KD3BA
Manufacturer: SMP
Device name: bq20z451
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 0201
Hardware Revision: 000a
Cell Revision: 0158
Charge Information:
Charge remaining (mAh): 4997
Fully charged: No
Charging: No
Full charge capacity (mAh): 5654
Health Information:
Cycle count: 113
Condition: Normal
Battery Installed: Yes
Amperage (mA): -2222
Voltage (mV): 11807
Can anyone help me?

13'' MacBook Pro, Mac OS X (10.6.6)
  • 1. Re: Battery Life Suddenly Bad
    nobodyshome101 Level 1 Level 1 (0 points)
    I'm having the same issues. I only had Firefox or Chrome running and my battery went from 7 hours to 4 to 3 back up to 6 and eventually it only lasted 2 hours before it died. It was at 100% and lasted just 2 hours with minimal screen brightness and one program open. The Genuis Bar replaced my battery last week but it is still doing the same thing. My previous MacBook did not do this. The battery did not go up and down all day when it wasn't connected to a power source. It only went down. Does your computer run very loud as well?
  • 2. Re: Battery Life Suddenly Bad
    Spenser Hukill Level 1 Level 1 (0 points)
    Not overly loud but the fan is definitely louder than it used to be.
  • 3. Re: Battery Life Suddenly Bad
    eww Level 9 Level 9 (52,975 points)
    nobody: The time-remaining estimate in the menu bar increases or decreases from moment to moment depending upon what the computer is doing. When it's working hard, as when a Flash video is playing in a web browser, the time-remaining estimate decreases. When the machine is idle or doing something less demanding, it increases. The estimate is only an estimate, and it can only be based on the amount of energy the machine is consuming at any given time, and the assumption that that level of energy consumption will continue unchanged until the battery is drained. It has no way of predicting how your activities with the computer might change.
  • 4. Re: Battery Life Suddenly Bad
    Spenser Hukill Level 1 Level 1 (0 points)
    Any help for my end?
  • 5. Re: Battery Life Suddenly Bad
    neuroanatomist Level 7 Level 7 (31,690 points)
    Spenser Hukill wrote:
    it has been lasting barely three hours with absolutely nothing running. Here are the specs from system profiler.


    Based on the specs, your battery is in excellent shape.

    How do you know you have 'absolutely nothing running'? Have you checked Activity Monitor? Even if you have no apps open, there may be processes running in the background and using a high percentage of CPU activity. Stuck print jobs can cause this, for example.

    Check Utilities > Activity Monitor > CPU tab, set the pop-up menu to Active Processes, click on the CPU column header to sort, and see if anything is using a high amount of CPU capacity.
  • 6. Re: Battery Life Suddenly Bad
    Spenser Hukill Level 1 Level 1 (0 points)
    I had some odd Adobe process running that I was not aware of that was using 87.9 CPU. I just quit that process and I will post again In an hour or so with results improvement or not. Thank you. I hadn't thought of that.
  • 7. Re: Battery Life Suddenly Bad
    Spenser Hukill Level 1 Level 1 (0 points)
    Thank you so much. Before my battery was at 100% and it lasted 2.5 hours now its at 32% and lasting 3 hours. I don't know what that task was but I'm going to make sure it doesn't run again.
  • 8. Re: Battery Life Suddenly Bad
    neuroanatomist Level 7 Level 7 (31,690 points)
    Glad that fixed it. Thanks for the !

    Hung processes like that do occur from time to time. You can use a program like iStat Menus or MenuMeters to keep a real-time eye on your CPU loads. They can put a CPU usage plot on your menu bar, and if you see it running high when you aren't (intentionally) doing something processor-intensive, you will know about it immediately.
  • 9. Re: Battery Life Suddenly Bad
    Spenser Hukill Level 1 Level 1 (0 points)
    Do you know what the process 'kernal_task' is?
  • 10. Re: Battery Life Suddenly Bad
    neuroanatomist Level 7 Level 7 (31,690 points)
    Kernal_task is the root level process that manages thread scheduling, memory paging, etc.
  • 11. Re: Battery Life Suddenly Bad
    nobodyshome101 Level 1 Level 1 (0 points)

    What's the reason behind the sudden battery loss if there are no programs running that are using a high level of CPU? I opened the activity monitor and everything listed ranges from 0.0-1.2. The highest is Activity Monitor which is 9.2.

  • 12. Re: Battery Life Suddenly Bad
    douglas photography Level 1 Level 1 (0 points)

    I am also having the same problem.  I've checked the CPU levels and I do not have anything running high but I did notice the the CPU Idle percentage at the bottom left of the screen is 95% or more.  What does this mean?

  • 13. Re: Battery Life Suddenly Bad
    benfromsmyrna Level 1 Level 1 (0 points)

    In System Monitor Cpu usage you want to make sure that the drop-down menu reads "All Processes".  This will allow you to see everything that is running currently.  In my case, it initially read "My Processes" and did not show the process causing the high Cpu usage.

  • 14. Re: Battery Life Suddenly Bad
    KayLouise Level 1 Level 1 (0 points)

    How do I check utilities? Where is that located?

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