MBP 17 inch battery life

Discussion in 'MacBook Pro' started by precator, Mar 8, 2009.

  1. precator macrumors member

    Joined:
    Apr 10, 2007
    #1
    I am always getting less than 3 hours on my new 17 inch unibody. I have a feeling there is something wrong with my battery.. Is less than 3 hours normal (approx 2:45).
     
  2. kastenbrust macrumors 68030

    kastenbrust

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    Dec 26, 2008
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    North Korea
    #2
    I'm getting 9 hours with full brightness and using the more powerful 9600 card.

    Are you talking about Windows or OS X? Because using Windows 7 i get only about 2 hours too.
     
  3. ayeying macrumors 601

    ayeying

    Joined:
    Dec 5, 2007
    Location:
    Yay Area, CA
    #3
    kastenburst: Do me a favor, goto "About This Mac" > "More Info"

    Under "Power", can you post the entire "Battery Information". You may erase the Serial Number if you wish.
     
  4. kousuke18 macrumors regular

    Joined:
    Aug 25, 2008
    #4
    i had a good laugh after reading that.


    precator: are you sure you don't have any processes that are taking up cpu usage? 3 hours is not very good especially for the 17" unibody model.
     
  5. kastenbrust macrumors 68030

    kastenbrust

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    #5
    no problem, i've added it as an attachment below.

    what? laughing at your own naiveness?
     

    Attached Files:

  6. ayeying macrumors 601

    ayeying

    Joined:
    Dec 5, 2007
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    #6
    That would explain why kastenbrust has such a great battery life, even under full brightness + 9600GT video card.

    The battery for the MacBook Pro 17" Unibody should be ~12500 to ~13000 mAh. However, kastenbrust has over 17,000. Nearly 1.5 times more then the rest of us.

    Oh, incase you're wondering, I was trying to see if you also had a ~8 Volt rating. I thought it was just a little weird that this system draws 7.2 - 8 volts while my MacBook draws 11.1 - 12 volts.
     
  7. kastenbrust macrumors 68030

    kastenbrust

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    #7
    volts shouldn't affect battery life, only watts.
     
  8. ayeying macrumors 601

    ayeying

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    #8
    Volts helps calculate watts.

    Amps * Volts = Watts
     
  9. kastenbrust macrumors 68030

    kastenbrust

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    Dec 26, 2008
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    #9
    Apparently...according to Apple, this machine uses half the power, or Watts as a light bulb, so perhaps thats why.
     
  10. ayeying macrumors 601

    ayeying

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    Dec 5, 2007
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    #10
    I don't see that anywhere...

    However, at full brightness + 9600GT with light websurfing, it seems I'm using ~ 40 watts of power. If they're comparing to a regular 100 watt bulb, thats true.. or if its 60 watt bulb.. yeah, thats true too..
     
  11. Blaker macrumors newbie

    Joined:
    Feb 26, 2009
    #11
    How the heck is it even possible that he has 17000 mah????? Seems fake to me, unless they put a different battery in.
     
  12. kastenbrust macrumors 68030

    kastenbrust

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    North Korea
    #12
    There you go
    http://www.apple.com/mac/green-notebooks/#ad

    "Because Apple makes both the hardware and the software for the MacBook, we are able to design them to work together. This allows us to make a smarter product that uses less electricity, earning it ENERGY STAR certification. For instance, to reduce energy consumption, the MacBook hard drive spins down automatically when inactive. The MacBook also decides which processor — CPU or GPU — is best suited to efficiently perform a task. The processor even throttles down to save power between keystrokes as you type. The LED-backlit display in the MacBook is another feature that plays an important part in conserving energy, consuming 30 percent less power than conventional LCD displays. And the display is designed to dim when you enter a darkened room. Together, these adjustments make the MacBook family much more energy efficient. In fact, our most popular notebook, the MacBook, can run on just one-quarter the power of a single lightbulb."

    I find that pretty incredible to be honest.
     
  13. ayeying macrumors 601

    ayeying

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    #13
    Only makes reference to the MacBook running at 1/4 of a lightbulb (I guess 100 watts)
     
  14. bossxii macrumors 68000

    Joined:
    Nov 9, 2008
    Location:
    Kansas City
    #14
    12,671 mAh fully charged.

    Watched 2h20m of Hulu streamed video, 80% bright, wifi then web browsing, email for another 3 hours before I hit 6% and ended up plugging in.

    I'm only on day 4 with this uni 17" but more than impressed with battery life so far.

    @ kastenbrust o_O lucky you! Nice battery, is that just luck of the draw with a stock battery or is there an aftermarket already out?
     
  15. kastenbrust macrumors 68030

    kastenbrust

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    #15
    yeah but lets be honest the 17" isnt going to use that much more. Double at max.
     
  16. precator thread starter macrumors member

    Joined:
    Apr 10, 2007
    #16
    Here are my battery settings...

    Model Information:
    Serial Number: XXXXXXXXXXXX
    Manufacturer: DP
    Device name: bq20z951
    Pack Lot Code: 0000
    PCB Lot Code: 0000
    Firmware Version: 0042
    Hardware Revision: 0001
    Cell Revision: 0119
    Charge Information:
    Charge remaining (mAh): 6732
    Fully charged: No
    Charging: No
    Full charge capacity (mAh): 12359
    Health Information:
    Cycle count: 16
    Condition: Good
    Battery Installed: Yes
    Amperage (mA): -4060
    Voltage (mV): 7357
     
  17. kastenbrust macrumors 68030

    kastenbrust

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    #17
    16 cycles already?!?! :confused:
     
  18. ayeying macrumors 601

    ayeying

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    Dec 5, 2007
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    #18
    I'm at 27 right now.
     
  19. kastenbrust macrumors 68030

    kastenbrust

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    #19
    2 a day almost? :confused:
     
  20. ayeying macrumors 601

    ayeying

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    #20
    Give or take, yeah. I got my system on Feb 20th in the morning. I'm almost never at my desk unless I'm charging the system
     
  21. ECJ macrumors 6502

    ECJ

    Joined:
    Jul 5, 2006
    Location:
    Memphis, TN
    #21
    How do you have 17,000 mAh? Very lucky.
     
  22. ryannazaretian macrumors 6502a

    ryannazaretian

    Joined:
    Sep 21, 2008
    Location:
    Mississippi
    #22
    You're pulling 4 AMPS.

    12.358AH / 4A = ~3 Hours
    In that regard, everything looks good.

    4 Amps is a lot though.

    My 15" Unibody only pulls 368mA compared to your 4060mA. There is something definitely wrong. Check Activity monitor and see if you have a out of control application. There may also be defective hardware in your laptop causing you to pull 4 Ampers.
     
  23. precator thread starter macrumors member

    Joined:
    Apr 10, 2007
    #23
    Amperage..

    I shut down all apps besides Safari and my Amperage (mA): 3924


    This still seems really high. Should I make an appt to the genius bar? Does anyone else have a 17 inch unibody and can you tell me how much amperage you are pulling?
     
  24. ryannazaretian macrumors 6502a

    ryannazaretian

    Joined:
    Sep 21, 2008
    Location:
    Mississippi
    #24
    Try reinstalling OSX. I had a problem with my battery as well. the iStat Menu thing kills my battery life. Going from my normal 5 hours to 2.5 or 2 hours. There may be some process running that you are not aware of.
     
  25. ryannazaretian macrumors 6502a

    ryannazaretian

    Joined:
    Sep 21, 2008
    Location:
    Mississippi
    #25
    Here are my specs:
    Also, I guess I checked my amperage too early... Now it's hovering around 900, which is about right for this size battery.
     

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