Is it normal to lose 12% charge whilst the Macbook is sleeping overnight?

Discussion in 'MacBook' started by gusping, Aug 18, 2015.

  1. gusping macrumors 6502

    Joined:
    Mar 12, 2012
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    London, UK
    #1
    After 8 hours sleep my macbook went from 57% charge to 45%. This seems like a huge drop in charge to me. I've never had this much of a drop on any other Apple product.

    Is anyone else experiencing this?
     
  2. keysofanxiety macrumors 604

    keysofanxiety

    Joined:
    Nov 23, 2011
    #3
    Oddly enough the MacBook isn't listed there ... and the MacBook was introduced April 10th, yet that article was updated April 13th? I'm sure it's an oversight in the support document but can anybody 100% confirm if the MacBook is compatible with Power Nap? I can't see why it wouldn't be, though.

    @OP - if you go to Apple menu>System Preferences>Energy Saver, is Power Nap listed there? If it is, disable it and you might get better battery.

    If it isn't, please can you let us know? (I'd be interested to see why they wouldn't add in this feature)

    [​IMG]
     
  3. gusping thread starter macrumors 6502

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    #4
    It's not enabled.... Is the battery that bad on the new Macbook?
     
  4. zhenya macrumors 603

    zhenya

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    Jan 6, 2005
    #5
    No, something is preventing it from going fully to sleep. You need to go into the Energy Section of the Activity Monitor and sort out what is causing it.
     
  5. keysofanxiety macrumors 604

    keysofanxiety

    Joined:
    Nov 23, 2011
    #6
    Well you get better battery life on both the Retina MacBook Pro and the MacBook Air. Though it's still getting 9-10 hours, which is pretty good in the ultra-mobile industry.

    So what Apple told you was true ... from a certain point of view.

    [​IMG]

    Did you have any USB devices plugged in to charge while it was on sleep?
     
  6. Flunkyturtle macrumors 6502

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    Dec 20, 2011
    #7
    This - I always forget about this and then wonder why it's drained my battery. Leaving a USB external drive plugged in is a killer.
     
  7. xmichaelp macrumors 68000

    xmichaelp

    Joined:
    Jul 10, 2012
    #8
    I'm pretty sure 1 percent per hour sleeping is normal. Maybe that's just for earlier macs though... My 2012 MBP usually drains like 10 percent overnight.
     
  8. gusping thread starter macrumors 6502

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    #9
    Nope, nothing connected. I've only had it a few days so I don't have any compatible devices.
     
  9. polee macrumors 6502a

    polee

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    Jul 22, 2008
  10. Queen6 macrumors 603

    Queen6

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    #11
    Leave it to sleep overnight and then run this command in Terminal, if the issue persists. OS X does perform tasks when the user is offline.

    cat /var/log/system.log | grep -i "wake reason"


    Q-6
     
  11. Fishrrman macrumors G4

    Joined:
    Feb 20, 2009
    #12
    You might try powering it off for a few nights.

    Record battery capacity before shutting down.
    Check battery capacity just after starting up next day.

    What are the results?
     
  12. ahostmadsen macrumors 6502a

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    Dec 28, 2009
    #13
    Yes, I see a drop of about 1% per hour of sleep. It's because the rMB, as opposed to other Apple laptops, tries to stay constantly connected to WiFi, even with powernap disabled. If I switch off WiFi before putting it to sleep I loose 0% even if it sleeps for many hours.
     
  13. zhenya macrumors 603

    zhenya

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    Jan 6, 2005
    #14
    That's not true. It stays connected for 3 or 4 hours before going to into deeper sleep like all other recent Macs.
     
  14. Queen6 macrumors 603

    Queen6

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    #15
    No, that`s inaccurate. My own 1.2 and does not consume the battery when sleeping, nor do I disable WiFi, look at what you have installed. Just woke it after 36-48 hours 98%...

    Q-6
     
  15. ahostmadsen macrumors 6502a

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    #16
    I think it might have to do with the kind of WiFi router you have. I think what happens is that it has difficulties connecting, and then it consumes energy trying unsuccessfully to connect repeatedly. Often when it wakes up, it says it's connected, but there is no internet. Anyway, the evidence is clear. When WiFi is on, I loose 1% per hour, when it's off I loose 0%.
     
  16. zhenya macrumors 603

    zhenya

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    Jan 6, 2005
    #17
    right, it's the power to the ram that consumes the battery during that period until the system writes the ram contents to disk and can then power down the ram. If there were no usb devices connected, the most likely scenario is that something is preventing the system from going into that deeper sleep state where it can shut off power completely.
     
  17. zhenya macrumors 603

    zhenya

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    Jan 6, 2005
    #18
    In that case, it's probably not the wifi directly causing the problem, but rather some program keeping the network connection alive and preventing the computer from going fully to sleep.
     
  18. ahostmadsen macrumors 6502a

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    Dec 28, 2009
    #19
    I don't know what you mean by 'recent.' My 2011 MBA never stayed connected to WiFi while asleep. But perhaps it's true for more recent models, not only rMB.
     
  19. zhenya macrumors 603

    zhenya

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    #20
    I actually don't think that the wifi is supposed to stay connected, just that it keeps the system state stored in RAM for faster resume. On my MacBook it makes the sound of the network connecting a second or so after I open it, so wifi is not actually staying connected. Like I said above, if it is staying connected, it's likely because a program is not releasing the connection properly and your computer is never going to sleep, let alone hibernate.
     
  20. ahostmadsen macrumors 6502a

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    Dec 28, 2009
    #21
    I doubt it. The settings were transferred with migration assistant from my MBA, and the MBA did not have this problem. No new software installed.

    But is there anyway I can check if something is going on in networks while asleep?
     
  21. zhenya macrumors 603

    zhenya

    Joined:
    Jan 6, 2005
    #22
    Moving your settings from one device to another is exactly the kind of thing that can cause these kind of issues.

    In the Activity Monitor there is an Energy tab. Are there any processes that indicate that they are Preventing Sleep?

    You should also run the command Queen6 posted above.
     
  22. Queen6 macrumors 603

    Queen6

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    #23
    Right on the money...

    Q-6
     
  23. ahostmadsen macrumors 6502a

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    Dec 28, 2009
    #24
    I get a lot of these: Wake reason: RTC (Alarm). I can see from the Apple discussion forums that this is a common and unsolved problem with Yosemite. Perhaps El Capitain will solve it.
     
  24. Queen6 macrumors 603

    Queen6

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    #25
    I set my 1.2 rMB up from new and have not seen this issue. I travel globally for work and my portable Mac`s therefore interact with multiple routers same story none have wake up issues on 10.10 so I rather suspect it`s more related to individual setup than hardware, all have been set up from scratch...

    Q-6
     

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