Why do I get such crummy battery life?

Discussion in 'MacBook Pro' started by AHDuke99, Feb 22, 2009.

  1. AHDuke99 macrumors 68020

    AHDuke99

    Joined:
    Nov 14, 2002
    Location:
    Charleston, SC
    #1
    Seriously? I just bought a new battery for my 2.16ghz Rev A MBP, and the max I get on my battery is 2:10 when I first unplug it. I've calibrated once, reset my SMC, and always have my screen on the first notch. BT is off. It's at 75% after 25 minutes of usage. Is this all I can expect? Apple advertises 4 hours and I know that;s never right, but half that? Really? I might as well buy a desktop if I can hardly use it in more than one class during the day.
     
  2. mknawabi macrumors 6502

    mknawabi

    Joined:
    Feb 5, 2006
    Location:
    Irvine, CA
    #2
    Set your brightness to half, turn off bluetooth if you're not using it. If your laptop is set to High Performance mode, set it to Balanced.
     
  3. sn00pie macrumors 6502a

    sn00pie

    Joined:
    Jun 25, 2008
    Location:
    United States
    #3
    There is definitely something wrong with your notebook or the battery itself. Phone Apple.
     
  4. AHDuke99 thread starter macrumors 68020

    AHDuke99

    Joined:
    Nov 14, 2002
    Location:
    Charleston, SC
    #4
    My brightness is on its lowest level. My BT is off. It's also set to "better battery life" in energy settings. I don't know what "balanced" means.
     
  5. ftaok macrumors 601

    ftaok

    Joined:
    Jan 23, 2002
    Location:
    East Coast
    #5
    Go into the System Profile and see what the battery's stats are.

    Or use Coconut Battery.

    ft
     
  6. AHDuke99 thread starter macrumors 68020

    AHDuke99

    Joined:
    Nov 14, 2002
    Location:
    Charleston, SC
    #6
    Would it matter that I replaced my internal drive to a 360GB one from Western Digital? I obviously voided my warranty, so I can't phone Apple unless they don't notice my larger than usual Hard drive... :p

    However, I've never had good battery life with this machine.

    I am upgrading this summer once they go to the built in battery on the 15".
     
  7. AHDuke99 thread starter macrumors 68020

    AHDuke99

    Joined:
    Nov 14, 2002
    Location:
    Charleston, SC
    #7
    Battery Power:
    System Sleep Timer (Minutes): 5
    Disk Sleep Timer (Minutes): 10
    Display Sleep Timer (Minutes): 1
    Wake On AC Change: No
    Wake On Clamshell Open: Yes
    Display Sleep Uses Dim: Yes
    Reduce Brightness: Yes

    Battery Information:

    Model Information:
    Serial Number: Sony-ASMB012-3a31-c37a
    Manufacturer: Sony
    Device name: ASMB012
    Pack Lot Code: 0001
    PCB Lot Code: 0000
    Firmware Version: 0110
    Hardware Revision: 0500
    Cell Revision: 0303
    Charge Information:
    Charge remaining (mAh): 3485
    Fully charged: No
    Charging: No
    Full charge capacity (mAh): 5461
    Health Information:
    Cycle count: 3
    Condition: Good
    Battery Installed: Yes
    Amperage (mA): -2492
    Voltage (mV): 11562
     
  8. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #8
    Balanced means your computer will automatically shift between "Better battery life" and "Maximum Performance" based on usage needs. This is good if you need power on the go, but otherwise you will be just checking emails, so then it will go back to slow mode.
     
  9. Michael CM1 macrumors 603

    Joined:
    Feb 4, 2008
    #9
    Your full charge capacity is better than mine (about 5000 on mine) and I have the same model you do. I would check what the heck is up with the negative Amperage on your status. That doesn't sound right.

    I should also ask if the computer says 2:10 or if you actually get 2 hours and 10 minutes of life. That is just an estimate. I would also recommend using iStat to monitor your CPU use. If that gets jacked up due to certain Web sites, that'll kill battery time. If your HDD is spinning, that kills battery time. If you're using your DVD drive, same deal.
     
  10. scarboni21 macrumors regular

    Joined:
    Jun 23, 2008
    #10
    you did not void your warranty ram and hd are user replaceable parts
     
  11. winninganthem macrumors 6502a

    winninganthem

    Joined:
    Jun 10, 2008
    #11
    Before the newer Unibody MBPs, hard drives are not considered user-serviceable. RAM is though.
     
  12. motulist macrumors 68040

    motulist

    Joined:
    Dec 2, 2003
    #12
    You might've gotten a bum battery. It happens. Is this an Apple branded battery or a 3rd party battery?
     
  13. drewsof07 macrumors 68000

    drewsof07

    Joined:
    Oct 30, 2006
    Location:
    Ohio
    #13
    Interesting, what makes you think this will happen?
     
  14. nb705 macrumors newbie

    Joined:
    Jan 22, 2008
    #14
    Umm, This is pretty standard, it's just what happens when the Battery discharges. The measured current is negative because it's flowing out of, rather than into the battery.

    If you must know, Current is a vector quantity, and current-meters (Ammeters) will measure both magnitude and direction of current flow.
     
  15. AHDuke99 thread starter macrumors 68020

    AHDuke99

    Joined:
    Nov 14, 2002
    Location:
    Charleston, SC
    #15
    I just assume it will. I expect all Apple laptops will move towards the longer, non-user replaceable battery.

    Should I go to the Genius bar? I doubt my computer itself is under warranty as I never bought Applecare, but I just bought this battery for it. If I'm supposed to be getting more than 2 hours on a charge, something is wrong....

    And I'm probably getting under 2 hours. The estimate says 2 hours 10 minutes, but I took it off the plug at 11pm last night, and it was dead by 1am.
     
  16. drewsof07 macrumors 68000

    drewsof07

    Joined:
    Oct 30, 2006
    Location:
    Ohio
    #16
    Have you calibrated it yet, since you just purchased it? It is possible that it has been on the shelf for months wherever you bought it from (including the Apple store)
     
  17. AHDuke99 thread starter macrumors 68020

    AHDuke99

    Joined:
    Nov 14, 2002
    Location:
    Charleston, SC
    #17
    I calibrated it once when I first put it in my computer.
     
  18. Repo macrumors 6502a

    Repo

    Joined:
    Feb 11, 2009
    #18
    I look forward to that happening. The "Non-User Replaceable Battery" is actually quite easy to replace, and by the time I would need to replace it (if I ever did), my warranty would be up.
     

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