Mac Book Pro battery life...?

Discussion in 'Mac Pro' started by Kingsly, Feb 15, 2006.

  1. Kingsly macrumors 68040

    Kingsly

    #1
    A lot of people have been asking what the battery life will be for the Mac Book Pro. Seeing as how Apple has not been kind enough to post thier own results, I did some research and have reached some preliminary conclusions.

    Lets start with some pointers:

    A) 1.42 ghz G4 draws around 30 watts. (thanks Longofest)
    B) 1.83 ghz Core Duo draws 31 watts.


    Considering that the 15" PBG4 is 1.67 ghz one would have to assume that if anything the G4 Processor draws more power. On the other hand, the MBP has a 67% brighter screen, so there you go. I dont know the specs of the screen such as current draw (could someone find out?) but I assume it more than balances out. Then again, it may be an exponential situation where a little more power gives alot of brightness...?

    Anyway, assuming the current draw is similar for the two computers we shall, without further ado, proceed to the good part:

    1) The 15" PBG4 uses a 50 W/h battery
    2) the MBP uses a 60 W/h battery

    Soo...

    The MacBook Pro should get the same if not better battery life than the 15" PowerBook!
    I am guessing (hoping, praying) 5.5 - 6 hours of battery life.
     
  2. Dr. J macrumors member

    Joined:
    Jan 9, 2006
    #2
    I would doubt that the battery life will be that long. If it was, Apple would have listed that among the features of the MBP.
     
  3. Kingsly thread starter macrumors 68040

    Kingsly

    #3
    Unless the screen draws some insane amount of power I doubt its less than the PB.
     
  4. Benjamindaines macrumors 68030

    Benjamindaines

    Joined:
    Mar 24, 2005
    Location:
    A religiously oppressed state
    #4
    Well it is the same brightness as the regular displays, so I would say it uses more power then the screen in the PowerBook. But all you have to do is turn the brightness down a little and you're good to go.
     
  5. AJBMatrix macrumors 6502

    AJBMatrix

    Joined:
    Feb 6, 2006
    Location:
    Athens, Georgia
    #5
    There are several things that you can do to cut down the battery usage. Like turn off wifi if you are not using it. And turn down the Brightness of the screen. You can also do things like shutting off the speakers that will help a little. If you have the computer on something that will trap heat in it will use more battery life. So keep it ventilated.

    The CPU will clock down when not being used. The CPU can also turn off a core if it is not being used. All of these will help the battery life and Apple has always had really good power management ability with the batteries.
     
  6. Josh396 macrumors 65816

    Josh396

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    Oct 16, 2004
    Location:
    Peoria/Chicago, IL
    #6
    I think that's something a few people are looking over or forgetting about. Apple always makes sure to announce any improvement in any new product, which leads me to suspect the battery life is the same or even possibly worse. My guess is it will be about the same spot it is right now.
     
  7. AJBMatrix macrumors 6502

    AJBMatrix

    Joined:
    Feb 6, 2006
    Location:
    Athens, Georgia
    #7
    Battery Life: I talked to Dell about there 17" blah blah blah Core Duo. And they did not have any battery life specs up online so I called technical support and asked them what it was. And of course I had to call 3 times and got cut off once and transferred to a dead line the second time. But the 3rd time was the charm. I talked to a guy that seemed to know a lot about the Dell version and he said that with the standard battery you should get 4.5 to 5 hours. I had a Dell and that would be an act of God if that happened on it. But he said that you could add an hour with the upgraded battery. So if Dell is looking at "4.5 to 5 hours" probably "3.5 to 4 hours" then we should get at least 5 and ours will have a slightly better battery. And the battery power management abilities of Apple are far better than the MS ones.
     
  8. xparaparafreakx macrumors 65816

    Joined:
    Jul 29, 2005
    #8
    Just wait until the people get their MBP, then talk about it. I have learn to get used to haveing an extra battery in my backpack.
     
  9. asherman13 macrumors 6502a

    asherman13

    Joined:
    Jul 31, 2005
    Location:
    SF Bay Area, CA
    #9
    Unless they hadn't finished with their oh-so-thorough battery life benchmarks, and felt that having speed benchmarks were more important @ MWSF, so they ran speed but not power benchmarks.

    Also, since the MWSF models were definately pre-production, (not just processor wise; why else would they wait this long to ship?) there's quite a decent possibility that the batteries people "tested" at MWSF weren't the ones people will be getting (perhaps those were Lithium Ion, while the new ones are...(checks insanely-dog-eared Technology Overview printout) Lithium Polymer.
     
  10. dblissmn macrumors regular

    Joined:
    Apr 30, 2002
    #10
    Not that I want to burst anyone's bubble, but Dell's top of the line Core Duo laptop has an 80 watt-hour battery as opposed to the 60wh battery Apple has used. Even if you allow that Dell's wattage advantage is accounted for by the higher drain of Windows and a 17 inch display, I don't expect we're going to see the Apple doing better than this Dell for battery life.
     
  11. jacobj macrumors 65816

    jacobj

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    Jersey
    #11
    Can we not be a little clever here. Run a task on a 15" PB that hits the processor hard and turn the brightness off... give it a few minutes and then turn brightness to full! Take a reading as soon as you turn the brightness back up and then wait a while and take another reading to see what the difference is. Work out what percentage of battery time is given over to the brightness of the screen and then add 67% to it (worst case scenario). Then we can see if the extra power in the MBP covers it!

    Only slightly scientific but worth a go.

    What we haven't considered is the X1600 card in it...does anyone know what the X1600 draws also we need to know what the Radeon 9700 draws
     
  12. oldMac macrumors 6502a

    Joined:
    Oct 25, 2001
    #12
    Expect Worse Battery life

    Yes, Apple has generally been good with battery management, but that's a combination of Hardware + Software.

    I would expect that Apple's Hardware+Software integration for something like battery management is not as mature for Intel as it was for PPC. Probably it will get better over time as newer versions of OS X become available, and the Apple and Intel engineers learn more about each other.

    However, it's not reasonable to expect that 0+ year system, with roughly the same cpu wattage and a brighter screen would be on-par with a 4+ year mature hardware+software integration, unless the battery itself is significantly better.
     
  13. Mr. Mister macrumors 6502

    Joined:
    Feb 15, 2006
    #13
    Does the Core Duo have any sort of power scaling?
     
  14. excalibur313 macrumors 6502a

    excalibur313

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    Jun 7, 2003
    Location:
    Cambridge, MA
    #14
    It is surprising that even though they are shipping the macbooks they still haven't updated their website. Could it be that they haven't arrived at the length they want and intend to tweak it further?
     
  15. jacobj macrumors 65816

    jacobj

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    Jersey
  16. AJBMatrix macrumors 6502

    AJBMatrix

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    Athens, Georgia
    #16
    To dblissmn: Please know what you are talking about. And read my post before saying that I am wrong about something.

     

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  17. jacobj macrumors 65816

    jacobj

    Joined:
    Apr 22, 2003
    Location:
    Jersey
    #17
    Nobody has received confirmation that they are actually shipping. I think we should expect further delays and the lack of battery life is a sign of it. Or else the battery performance of the MBP is poor and Apple don't want to make it that public and will rely on people not researching such things further.
     
  18. AJBMatrix macrumors 6502

    AJBMatrix

    Joined:
    Feb 6, 2006
    Location:
    Athens, Georgia
    #18
    Everyone here really looks to the darkest possibility of things don't they. It is nice to hope. Plus the battery is better, the CPU takes about the same power and has better control over power functions than the G4, the video card uses about the same power, and the screen should be able to be turned down. If you do the standard power saving options I do not see why you would have much less battery life. Now if you are going to be gaming or something major, you should always carry the cord with you. I have never had a laptop that can last more than 1.5 hours playing a game.
     

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