Previous 1 189 190 191 192 193 Next 3,346 Replies Latest reply: Aug 27, 2014 4:12 PM by TammyVB Go to original post Branched to a new discussion.
  • Nickholl Level 1 Level 1
    expertise.macosx
    Mac OS X

    hey guys - you know mountain lion has a power nap feature that does certain things when your computer is asleep. It may be that you have this activated and it drawing on your power. Try turning it off and seeing what happens.

  • Nickholl Level 1 Level 1
    expertise.macosx
    Mac OS X

    so - I have a mac genius appointment booked for tonight and was going to ask them to sort out my computer (as its still under warranty)

     

    Brought it into work and now the battery shows 8hours!   Regardless of the time I get out of the machine - the estimations are all ooooover the place - and I've had a fair few charge cycles and would expect it to be stable!

  • Jerry Nick Level 1 Level 1

    Same here. Brand new MacBook Pro i7 2.3 Ghz. Thought it was because I've putted in another hard drive but found this discussion. Even in sleep mode it consumes 5-10% of battery life within 12 hours. Weird, and obviously it has something to do with ML.

  • Nickholl Level 1 Level 1
    expertise.macosx
    Mac OS X

    you tried turning off power nap?

  • Jerry Nick Level 1 Level 1

    There is no power nap on this machine (non-retina), is there..?

  • Nickholl Level 1 Level 1
    expertise.macosx
    Mac OS X

    sorry - I thought it was a ML feature - perhaps its retina only

  • groovyf Level 1 Level 1

    Powernap when on battery is most definitely turned off (but on when plugged into mains).

    I might turn that off to test, but I know I get a TM backup when it's plugged in, and don't get one when it's not.

  • Jerry Nick Level 1 Level 1

    It is a ML feature. But ss far as I know power nap is limited to SSD equipped Mac's.

  • Bill Jacobs2 Level 1 Level 1

    Nickholl said:

    "Brought it into work and now the battery shows 8hours!..."

     

    Going to annoy you here with my longshot question:

     

    Do you plug your Macbook in to a cabled ethernet network when you are at work?

     

    My customer found his battery life was just fine when he reset the SMC then avoided using wireless.

    Perhaps your work doesn't have a wireless network set up so you're observing the same thing.

     

    Also curious if any other users here are experiencing their poor battery life after resetting their SMC and using CABLED ethernet only.

    No one replied when I asked last time, but the thread has been livelier over Thanksgiving.  Anyone willing to check for me?

  • Nickholl Level 1 Level 1
    expertise.macosx
    Mac OS X

    My time estimate still seems to be wildly unpredictable - the % does seem stable however. What do people think - is the % quite a reliable stat to go by?

  • Csound1 Level 8 Level 8
    expertise.desktops
    Desktops

    Nickholl wrote:

     

    My time estimate still seems to be wildly unpredictable - the % does seem stable however. What do people think - is the % quite a reliable stat to go by?

     

    The only reliable way to see how long your battery will last is to run it until it is flat, everything else is a guess (or estimate if you prefer)

  • Nickholl Level 1 Level 1
    expertise.macosx
    Mac OS X

    yeah I guess  .The % prediction does seem to be a lot more stable than the predicted time though

  • Csound1 Level 8 Level 8
    expertise.desktops
    Desktops

    Nickholl wrote:

     

    yeah I guess  .The % prediction does seem to be a lot more stable than the predicted time though

    But is it right?

  • crossbytje Level 1 Level 1

    Off course it is right, it is just reading the amperages from your battery. But it might very well be the case that the first 50% drains quicker than the last 50%!

  • Nickholl Level 1 Level 1
    expertise.macosx
    Mac OS X

    hard to tell. It does seem to be reassuringly high though   ie. Ive been using the laptop for a couple of hours and it says 61%. the time estimate goes between being 3.5 and 5 hours. This is a lot better than what I used to get before doing a fresh install. I might try reinstalling from my time machine backup tomorrow and hope nothing changes :-s