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Q: Bad battery life, 2015 rMBP

Hey,

Recently I noticed that my overnight battery lose (when the lid is closed, power on) is a... lot! today I got from 74% to almost 60%, I noticed that my antivirus had a lot of update activity during the night, but we are talking about 14%!!, anyway the remaining time estimation is also low (and In my opinion, very inaccurate) screenshot attached..

how should I diagnose it? or... Is it normal?

 

Thanks in advance

 

Screen Shot 2016-05-16 at 8.17.24 PM.png

MacBook Pro with Retina display, OS X El Capitan (10.11.4)

Posted on May 16, 2016 10:19 AM

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Q: Bad battery life, 2015 rMBP

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  • by leroydouglas,

    leroydouglas leroydouglas May 16, 2016 10:55 AM in response to Ytech
    Level 7 (23,578 points)
    Notebooks
    May 16, 2016 10:55 AM in response to Ytech

    I for one would remove /uninstall the antivirus—it will only lead to trouble. This is not a Windows machine.

     

    You can always Try resetting the  SMC http://support.apple.com/kb/ht3964

     

    You can assess battery health in >System Info>Power

     

    Coconut Battery.app can give you "live" relative comparison of health from the dropdown menu CoconutBattery>CoconutBattery Online

  • by Ytech,

    Ytech Ytech May 16, 2016 11:24 AM in response to leroydouglas
    Level 1 (13 points)
    Mac OS X
    May 16, 2016 11:24 AM in response to leroydouglas

    Thanks for your respond,

    what I was trying to figure out is that in new rMBP, that only has 25 cycles on it, it is normal to get 4:4Xhr of battery life in around 57~%?

     

    Thanks

  • by Courcoul,

    Courcoul May 16, 2016 11:30 AM in response to Ytech
    Level 6 (14,193 points)
    May 16, 2016 11:30 AM in response to Ytech

    You're running crâp that's causing unneeded workload on the Mac and contributing to the diminished battery life. What's more, some of it is impeding sleep and causing yet more drain overnight. My Mid-2015 15" rMBP barely moves the battery level after 10-12 hours closed.

     

    In order to ascertain what might be amiss with more tangible and quantitative data, run EtreCheck and post the report here. We can work from there.

  • by Allan Jones,

    Allan Jones Allan Jones May 16, 2016 11:39 AM in response to Ytech
    Level 8 (35,151 points)
    iPad
    May 16, 2016 11:39 AM in response to Ytech

    Many third-party anti-virus and cleaning utilities can shorten battery runtime (technically, "battery life" is how long the battery works before it requires replacing) and none are needed by Mac OSX today. They all border on scams, targeting switchers from Windows who have been told for years that no computer can run properly without steaming piles of third-party utilities.

     

    This Apple article is very helpful in looking for things that stress your battery:

     

    Apps can affect Mac performance, battery runtime, temperature, and fan activity - Apple Support

     

    Step 1 is very important is getting good resilts. I also find that the test is not very useful immediately after a reboot because not all processes that can affect runtime may launch on statup. I do the test this way.

     

    1) Use the computer normally for several hours

    2) Quit any applications I have launched

    3) Open Activity Monitor making sure I did step 1 from the article.

    4)Then I run the test.

     

    Look for processes that consistently appear to use more that about 10 percent of the processor cycles. You will be viewing active sampling so it benefits you to watch the processes as they swap places for at least a minute, noting the ones if any that are using the most of the cycles.

     

    Post what you find here and we can help you find the troublemakers.

     

    AJ