13 inch rMBP 7 hours battery life???

Discussion in 'MacBook Pro' started by Ellenccc, Feb 7, 2015.

  1. Ellenccc macrumors newbie

    Joined:
    Jan 25, 2015
    #1
    Hi guys, I just purchased my 13" rMBP (the mid-range 256GB one) yesterday. After a first full charge, at 100% battery remaining, the estimated time remaining shows to be 7:10??? There is no app open, nothing is running. Why is the battery life under 8 hours? I thought the 13" is supposed to have 9 hours? I got a low-end 13" before I exchanged it for this one, the previous one had more than 10 hours after a full charge.

    Is this an issue?? Should I bring it back to Apple? :(
     
  2. Woodcrest64 macrumors 65816

    Woodcrest64

    Joined:
    Aug 14, 2006
    #2

    Lower your brightness to 66 to 70%ish... Don't touch the computer for 1 minute, then check and tell us what it says.
     
  3. Ellenccc thread starter macrumors newbie

    Joined:
    Jan 25, 2015
    #3
    It says 7:59 at 97% now. Normal?
    Does low/mid end models differ in battery life because of the difference in SSD? It shouldn't right?...
    I got something like 10:22 once with the 13" that I returned...
     
  4. mlemonds macrumors 6502a

    mlemonds

    Joined:
    Apr 9, 2008
    Location:
    Lexington, KY
    #4
    I wonder if like phones, a mac benefits from a couple battery cycles to get properly calibrated. I just got a new 15" and the first time it said i only had a little over 5 hours on a full charge. Now I am getting closer and sometimes exceeding the advertised 8 hours. Give it a couple cycles and see what happens?
     
  5. Ellenccc thread starter macrumors newbie

    Joined:
    Jan 25, 2015
    #5
    That makes sense! I guess I'll be patient and if it a couple of cycles and see. Thanks!
     
  6. Meister Suspended

    Meister

    Joined:
    Oct 10, 2013
  7. nobodyjustwalks macrumors regular

    Joined:
    Jan 23, 2013
    #7

    The reason you're seeing varying times in the "time left" display is because it's not a static measurement.

    Depending on your screen and keyboard brightness, depending on if you're touching your trackpad or keyboard while waiting for the measurement, depending on what programs you're running and what those programs are doing, your "charge left" times will vary. I can boot my computer, turn my brightness down to about 50-65% and touch nothing, and my battery estimate easily jumps into the 10-12 hr range. Then, the instant I being using my computer the "time left" indicator drops because it's revising its estimate according to what I'm doing. Generally down to the 4-7 hr range.

    Does this mean your computer will last only as long as is displayed? That's hard to tell because during normal use we work on our computers, then let them sleep, then continue working; not to mention the specific programs we're running. Are we watching videos or surfing the web? Are we using Chrome (a resource hog) or Safari, optimized for Yosemite?

    Lastly, Apple's estimates are gotten from testing within specific parameters. Personally, I don't think Apple's test represents the type of usage most MBPs see and to tell you the truth what test would? They could do it differently, sure. But there are so many ways we use our Macs it'd be hard to quantify for a broad swath of the MBP buying public.
     
  8. Natzoo macrumors 65816

    Natzoo

    Joined:
    Sep 16, 2014
    Location:
    Not sure where i am
    #8
    yeah i got 4 hrs on my 15" retina but i have full brightness on and one tab open on safari.
     
  9. Z3man macrumors 6502a

    Joined:
    Feb 19, 2012
    Location:
    UK
    #9
    Full brightness:eek:, are you wearing sunglasses.

    I have just got the base 15" rMBP and i am getting between 8 and 9 hours when surfing and/or playing music, i have the brightness set at 50%. If i have it set at 100% i can't look at the screen it is that bright.
     
  10. Natzoo macrumors 65816

    Natzoo

    Joined:
    Sep 16, 2014
    Location:
    Not sure where i am
    #10
    wow i must be blind:D. My mac is always at full brightness during the day.
     
  11. Z3man macrumors 6502a

    Joined:
    Feb 19, 2012
    Location:
    UK
    #11
    You must have a lot more sun over there and need a brighter screen, its winter over here and not a lot of sun in the UK. To use full brightness here in the UK i would have to be sat outside,
     
  12. Natzoo macrumors 65816

    Natzoo

    Joined:
    Sep 16, 2014
    Location:
    Not sure where i am
    #12
    i took your advice and turned down my display brightness to 3 less from the max and i have over 6 hrs of battery life.
     
  13. JHUFrank macrumors 6502a

    JHUFrank

    Joined:
    Apr 16, 2010
    #13
    Guys, I will just say it flat out here and now, I have never gotten more than 4.5-6 hours of battery life on this rMBP. I still love it. Much better display than my Air, great design, lots of storage and 16gigs of ram. Great VM machine.
    But it just doesn't have great battery life. I would get 9 hours of my MBA. IMO, its a good tradeoff.
     

Share This Page