15" MBP "8-9 Hour Battery Life"???

Discussion in 'MacBook Pro' started by japes98, Jun 15, 2010.

  1. japes98 macrumors newbie

    Joined:
    Jun 15, 2010
    #1
    Hi all,

    My new MBP ($1799 15" i5) arrived last week. I've had it plugged in for the last few days.

    Today I needed to go remote. I've been unplugged for 2.5hrs (full charge, screen brightness @ 1/2, using integrated graphics only, doing nothing taxing -- CPUs always under 10% or so, more like 2%) and my battery is currently down to 35%!

    :(

    Not much better than the 2008 MBP that it replaced. Anyone else having similar (bad) experiences with battery life?

    -jp
     
  2. dusk007 macrumors 68040

    dusk007

    Joined:
    Dec 5, 2009
    #4
    It also took me a while to understand how to get the most out of the battery.
    Get iStat (it works for 14 days as trial that is enough to figure stuff out) it shows you an estimate of you power usage.

    The thing you have to understand is there is a huge difference between 2% CPU usage and none. Just run µtorrent in the background and battery life is 30-40% worse. Check with the Activity Monitor your processes. One process that uses 2-3% CPU kills battery if it does this continuously.

    Also if you scroll with your touchpad battery life is much worse. If you simply read stuff on the web. Move your hand away from the touchpad and use cursor keys to scroll or FN+ cursor. This way the CPU is for a longer time completely idle and can enter the deepest sleep states. Typing also uses significantly more energy than reading.

    OSX saves battery very well but the deep sleep states of the CPU only work if it has nothing to do for some time and just a little work all the time is enough to reduce battery life quite a bit.


    When I got my MBP I thought it is bad on the battery although I already have the newer K0 Stepping CPU. It looked like 5-6 hours if I don't tax it too much. Now I can get about 7h typing and even more just surfing non flash websites. Just reading PDFs or non Flash Websites is probably how Apple achieves there battery life numbers. Display brightness has a big influence too of course. But I can still get about 5h outside at max brightness.

    10h is about the highest my estimates go up on idle. In some reviews they write about 11h+. That is a little of a lottery I guess what CPU you get and how cool it runs.
     
  3. animan macrumors member

    Joined:
    May 1, 2010
    #5
    Idle??

    The claim is 8 to 9 hours of Wireless productivity. We don't even come close.
     

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  4. robotmonkey macrumors 6502

    Joined:
    Apr 24, 2010
    #6
    My 13 inch lasts for probably 6 while under constant internet use, a few days at idle.
     
  5. xster macrumors newbie

    Joined:
    Nov 25, 2008
    #7
    I seem to be getting less than 2 hours on Windows 7 lol. Worse than late-2008 13"
     
  6. Eithanius macrumors 65816

    Joined:
    Nov 19, 2005
    #8
    I'm on 15" Core i7, doing constant wireless productivity, browsing and instant messaging at half the screen brightness, backlit keyboard always enabled at 2/3 level. Some light Excel work which triggers the GT330 card. Already 4 hours non-stop, battery is still around 40%.
     
  7. SurferMan macrumors 65816

    Joined:
    May 14, 2010
    Location:
    South FL
    #9
    yeh my 13 last 5-6 hours constant internet use and few other things. Fine with me, better than most any other laptop except the netbooks (gf's and even friends 12" gateway last 9-10 hours on use).
     

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