'Normal' Battery Life on New MBP

Discussion in 'MacBook Pro' started by CuriousGeorgeNC, Jun 20, 2007.

  1. CuriousGeorgeNC macrumors newbie

    Joined:
    Jun 8, 2007
    #1
    Hi all, I know that this is a bit hard to gauge because there are many variables that one must consider when it comes to battery life, but I wanted to see what sort of performance folks are getting as mine is a far cry away from the quoted 6 hours.

    First off, I have the 15.4in, 2.4g model.

    I am running my screen at just less than half of the full brightness setting and have MSWord, iTunes and Entourage open. I am also using an external screen (don't know if this is a culprit). My battery is lasting about 2hrs 15min before I have to plug in. I've drained and recharged the battery once while the computer is off and this is the average performance I'm getting.

    Any thoughts? Thank you all...
     
  2. psychofreak Retired

    psychofreak

    Joined:
    May 16, 2006
    Location:
    London
    #2
    I'm not sure if this is normal or not, but remember that emulating PPC processors (using Rosetta for Word and Entourage) drains power. If you don't NEED the advantages they bring, check out NeoOffice for a Word replacement :)
     
  3. katorga macrumors regular

    Joined:
    Oct 28, 2006
    #3
    Vendor times always off

    Vendors always quote a battery life number that is always too high. I'm suprised they get away with it.

    Anyway, I get between 4:45-5:05 on my MBP 2.4 with power features set to max battery life, wifi on, and screen at around 60% brightness. Firing up something that maxes CPU and disk access will recaculate to around 3-3:30.

    My MBP seems above average for a 15.4" laptop with a dedicated GPU and a similar size battery.
     
  4. CuriousGeorgeNC thread starter macrumors newbie

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    Jun 8, 2007
    #4
    Yeah, I certainly am not expecting the near 6 hours of it but even half that would be nice...
     
  5. CuriousGeorgeNC thread starter macrumors newbie

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    Jun 8, 2007
  6. docc macrumors 6502

    Joined:
    Jun 19, 2007
    Location:
    Miami
    #6
    You'll definitely get more than half the quoted battery life but again it comes down to what you plan to do. If you're talking about regular browsing, emailing, ichat etc, then i don't see why you won't be able to get atleast 4 hrs which is pretty good IMO.
     
  7. CuriousGeorgeNC thread starter macrumors newbie

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    Jun 8, 2007
    #7
    Well another problem I am having is that it is taking about double the time it says it needs to charge the battery. For example, at 11:45 it said it needed 1:45 to charge and as of 2:05 it still says it needs another 15 minutes...
     
  8. devilot Moderator emeritus

    devilot

    Joined:
    May 1, 2005
    #8
    As others have mentioned, running apps that require Rosetta will drain the battery more. Driving an external display will surely tax your system's resources and therefore, yes, even the battery.

    Also, do you have Bluetooth and Airport enabled? If so, those two drain the battery as well.
     
  9. CuriousGeorgeNC thread starter macrumors newbie

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    Jun 8, 2007
    #9
    I have Bluetooth turned off and am using the AirPort.
     
  10. Big D Skins macrumors newbie

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    Jun 8, 2007
    Location:
    Indiana
    #10
    I seem to be getting 5.5 or so with just internet surfing and chatting online. I get around 4, maybe a little more with more intensive programs running. Overall I am pleased with the battery life in a product of this power!!
     
  11. Sopranino macrumors 6502

    Joined:
    Sep 27, 2006
    Location:
    Alberta, Canada
    #11
    Your time seems to be way lower than what could reasonably be expected. I suspect, as others have already pointed out, that the second screen and two of the apps may be eating up more power than expected.

    What you might want to do is a little bit more of a 'scientific test':
    1) Same apps open as listed except no second screen (record the time that the battery lasts)
    2) Remove MSWord, keep iTunes and Entourage open and reconnect the second screen (record the time that the battery lasts)
    3) Remove Entourage, keep iTunes and MSWord open with the second screen connected (record the time that the battery lasts)

    This will give you some data which should point to where the power drain is coming from.

    Keep in mind that high energy requirements from two separate items (say the second screen and Entourage/MSWord) will compound the drain when open or operating together.

    Report back with your findings as they will be helpful to everyone.

    Sopranino
     
  12. falsecathedrals macrumors member

    Joined:
    May 16, 2007
    #12
    I get around 4 using safari on airport, itunes and soulseek. thats with the screen turned almost all the way up.
     
  13. CuriousGeorgeNC thread starter macrumors newbie

    Joined:
    Jun 8, 2007
    #13
    Sopranino-thanks for the suggestion. I've launched a bit of a test right now, removing the second screen and turning off AirPort and Bluetooth, assuming this should give me, according to what others have said, a good 4 hours or so. Early indication however is that it is still rather low, the battery has been disconnected for 20min and 16% has drained already with an expected life of just under 2.25hr. This is my second MBP in two weeks which is why I'm a bit bummed that there appears to be a problem as repeat trips to the Apple Store aren't fun.

    P.S. My screen settings are less than half brightness as well...
     
  14. Sopranino macrumors 6502

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    Sep 27, 2006
    Location:
    Alberta, Canada
    #14
    Okay, you're on the right path, however I would not (for the test) turn off the Airport and Bluetooth unless they were not on when you posted the original battery life. The whole idea is to isolate whichever device or app is causing a large power drain. By turning off the Airport and Bluetooth at the same time you risk biasing the test towards a larger delta in energy usage than you would normally get.

    Just a suggestion:)

    Sopranino
     
  15. CuriousGeorgeNC thread starter macrumors newbie

    Joined:
    Jun 8, 2007
    #15
    Well I think this is my impatience because I figure that if I get anything less than 2.5hrs even with AirPort off then something is wrong with the battery and I should just take it back and start over once again...and I am beginning to think this is the case because the % just keeps falling and I get different time quotes (i.e. 1:30 vs. 2:15) for how long it will last each time I wave the mouse over the battery gauge, even when at the same %age.
     
  16. Sopranino macrumors 6502

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    Sep 27, 2006
    Location:
    Alberta, Canada
    #16
    You do have a point there. I definitely agree that you should be over 2.5 hours with the tested setup. Good luck

    Sopranino
     
  17. cookiejuice macrumors member

    Joined:
    Jun 6, 2007
    #17
    Wow lots of battery life for you guys i am getting about tops 3:50 with wifi, firefox and mail.....with screen half way....you guys have any tips.....have bluetooth off
     
  18. eenu macrumors 65816

    eenu

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    Aug 11, 2006
    Location:
    Manchester, UK
    #18
    I only get 3hrs :( screen dim and only wifi on..... something not right there
     
  19. CuriousGeorgeNC thread starter macrumors newbie

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    Jun 8, 2007
  20. anirban macrumors 6502a

    anirban

    Joined:
    Jan 9, 2007
    Location:
    Houston, TX
    #20
    After reading this post at 11a EST, I decided to run a cheap test on my new MBP. I unplugged the power that time, and I have been running iTunes, Apple Mail, Firefox, Airport, and Bluetooth. The brightness is set at about 50%.

    It is 3.40pm, and my MBP is still alive and kicking... and projects about 15 minutes of more batter power, before it goes to sleep.

    Considering the amount of power this thing has, I would say that my battery life is impressive (4.5hrs+)
     
  21. Sopranino macrumors 6502

    Joined:
    Sep 27, 2006
    Location:
    Alberta, Canada
    #21
    That is NOT good! Time for a trip to the Apple Store for a new battery.

    However it is good to see that the reason is a bad battery and not the apps or devices causing a high energy drain.

    Sopranino
     
  22. cookiejuice macrumors member

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    Jun 6, 2007
    #22
    seriously lol!
     
  23. CuriousGeorgeNC thread starter macrumors newbie

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    Jun 8, 2007
    #23
    Don't know if this was it for sure--here's why. I tried to Apple+Q out of the System Info a few times and when I would look at the remaining charge, the # was the same. For some reason after the 4th/5th time I did it, there was a big drop, so it was just corresponding to the battery being drained.
     
  24. eenu macrumors 65816

    eenu

    Joined:
    Aug 11, 2006
    Location:
    Manchester, UK
    #24
    Sometimes it can take 5-10 cycles to get it going i am on number 6 now..... was getting 1hr on the first few now it quotes 4:20
     

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