2018 MBP - Battery draining even when plugged in?

Discussion in 'MacBook Pro' started by thebitguru, Aug 29, 2018.

  1. thebitguru macrumors member

    thebitguru

    Joined:
    Nov 15, 2016
    #1
    I am on a 2018 MBP with i9/32GB/1TB that I got a few days ago. I was on a video call (camera, screen share, and MBP speakers) for around two hours today. I started with 100% battery and ended up with 89% even though the MBP was plugged in all this time. CPU usage wasn't significant during this time, but even if it was, battery drain still doesn't make sense. I haven't noticed this in the past few days, and I did upgrade to the Supplemental Upgrade 2 that was release yesterday. Below are a few pictures of the iStat Menus graphs for some more data.

    I haven't had a chance to try a heavy workload since then so I will try that once I get some time.

    Has anyone else experienced this? Any thoughts on what might be going on here? Am I really somehow taxing this thing more than what it was designed for?

    upload_2018-8-30_0-33-43.png

    upload_2018-8-30_0-33-57.png

    upload_2018-8-30_0-34-4.png
     
  2. New_Mac_Smell macrumors 68000

    New_Mac_Smell

    Joined:
    Oct 17, 2016
    Location:
    Shanghai
    #2
    Obvious, but are you using the charger and cable that came with the machine or any after market stuff?

    Failing that, I'd just call Apple or take it in.
     
  3. thebitguru thread starter macrumors member

    thebitguru

    Joined:
    Nov 15, 2016
    #3
    Thanks for the response. Yup, using the stock charger and cable that came with the laptop.

    I am going to give this a few more days and see if I can reproduce it. I also am curious to hear if anyone else has experienced this...
     
  4. fokmik macrumors 68040

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    Oct 28, 2016
    Location:
    USA
    #4
    Dis you make the first cpu related update for the 2018 Mbp?
     
  5. thebitguru thread starter macrumors member

    thebitguru

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    Nov 15, 2016
  6. youssman macrumors newbie

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    Aug 31, 2018
    #6
    I have seen the same behaviour when playing a game on a i9/32GB/1TB.

    The macbook was plugged in, 100% of battery. After 30mn of gaming, the battery went down to 85%.

    I had only the first update at that time.

    Btw, have you noticed a huge battery drain when le macbook is closed, and supposed to be in sleep mode ? Mine cannot stay one night without going to 0%...
     
  7. thebitguru thread starter macrumors member

    thebitguru

    Joined:
    Nov 15, 2016
    #7
    You mean like the picture attached? :| This happened to me yesterday morning for the first time with this MBP. Yesterday, the CPU was throttled so much even after charging that I had to restart to get it back to normal. This morning I am noticing that, along with the battery at 0%, the sound refuses to come out of the MBP speakers.

    Honestly, I love the speed of the 2018 MBP, but I am quite disappointed with some of these odd issues. This is the sort of stuff that I would run into in a Linux machine and never with a mac. The whole "it just works" no longer seems to apply to Apple stuff :(

    Please let me know if you learn anything about any of these issues. Thanks!
     

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  8. chabig macrumors 603

    Joined:
    Sep 6, 2002
    #8
    I wouldn't worry about it in the least. My recommendation is to get rid of all that menu bar system monitoring stuff and just use the machine. Your job isn't to monitor hardware. In fact, maybe it's all that crap you've got running that taxes the machine! Have you ever seen how much CPU activity monitor uses?
     
  9. thebitguru thread starter macrumors member

    thebitguru

    Joined:
    Nov 15, 2016
    #9
    The iStat Menus widgets are quite helpful and they are not that taxing on the CPU/memory.

    upload_2018-8-31_10-19-6.png

    Also, the sleep problem existed on my 2016 MBP when I wasn't using iStat Menus so I am pretty sure that isn't the cause.
     
  10. chabig macrumors 603

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  11. thebitguru thread starter macrumors member

    thebitguru

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    Nov 15, 2016
    #11
    I used Skitch to create and markup the screenshots when posting here. It wasn't running during the battery drain.

    One question: even at 100% CPU, memory, GPU, and disk usage, should the battery ever go down when plugged in?
     
  12. chabig, Aug 31, 2018
    Last edited: Aug 31, 2018

    chabig macrumors 603

    Joined:
    Sep 6, 2002
    #12
    Why? macOS already has powerful screen shot tools.

    Probably. If the power adapter is built to handle the absolute maximum load, it will be bigger and heavier. Why do that when you have a charge accumulator (i.e., battery) already built into the product. Under load it makes sense to use the battery as a power supplement.
     
  13. Howard2k macrumors 68020

    Howard2k

    Joined:
    Mar 10, 2016
    #13

    Isn't it an 87W PSU? So yeah, it would certainly drain under max loads. It's 45W at base clock for the CPU alone, but if you're bursting and running accessories too, I imagine it's not difficult to max out that 87W.
     
  14. thebitguru thread starter macrumors member

    thebitguru

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    Nov 15, 2016
    #14
    I never noticed this with my 2016 MBP under max loads; granted it comparatively had lower power needs.

    Also, the above screenshots cover a relatively simple use case where the system wasn't really under full load. It's unfortunate that Apple is making these types of compromises... I am hoping that this is a software issue (like the throttling issue) and will be fixed in either Mojave or another future release.
     
  15. SOLLERBOY macrumors 6502a

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    Aug 8, 2008
    Location:
    UK
    #15
    the 2011 17" could also do this, the charger can't supply enough power when everything is maxed out.
     
  16. chabig macrumors 603

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    Sep 6, 2002
    #16
    It's not unfortunate. It's rock solid engineering.
     
  17. Howard2k macrumors 68020

    Howard2k

    Joined:
    Mar 10, 2016
    #17
    I think you're falsely extrapolating data points.

    You asked if it would drain under max loads. Yes it will. Just like the 2016.

    It shouldn't drain under low loads. I think you're misinterpreting what your system is doing (it's working way harder than you think) or you have some other software that is draining the battery. You also muddied the water by throwing in sleep.

    You need to consider whether you have several separate issues.

    Draining under heavy load - normal.
    Draining while sleeping while not plugged in - normal, to some degree.
    Draining while sleeping while plugged in - not normal, perhaps there is a task that is keeping it awake and it's actually not sleeping?
     
  18. chabig macrumors 603

    Joined:
    Sep 6, 2002
    #18
    Or stop worrying about it completely. Though based on the number of menu extras he has running to monitor system performance, he's probably obsessive compulsive and can't stop thinking about it.
     
  19. macintoshmac macrumors 68030

    macintoshmac

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    May 13, 2010
    #19
    That one cracked me up. :D
     
  20. SmilingKy macrumors newbie

    SmilingKy

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    Jan 29, 2019
  21. Eason85 macrumors regular

    Eason85

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    Jan 29, 2017
    Location:
    Hong Kong
    #21
    Hahaha I don't think he's intentionally trolling. He is actually serious!

    @thebitguru Coffee Lake is extremely power hungry, and can use up to 90W for an i9 or 75W for the i7-8750H. Apple has designed themselves into a corner with their current MBPs and thus, it looks like they can't supply them with enough power under load. Unfortunately this is not good for the longevity of your battery, even if performance isn't affected.

    Since it sounds like your machine has some problems anyway, I would return it for a base i7-8750H which will perform nearly the same and use much less power.
     
  22. thebitguru thread starter macrumors member

    thebitguru

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    Nov 15, 2016
    #22
    FYI, I ended up keeping the i9 model and, fortunately, whatever the problem was I have not hit it again. My guess is that they have improved the throttling to prevent this issue.

    The heat and the constant fans on the other hand is an consistent issue now :|
     
  23. phackwer macrumors newbie

    phackwer

    Joined:
    Feb 17, 2019
    #23
    I've noticed the same behaviour here sometimes. I unplug and plug the power adapter and it returns to normal charging. This has been happening to me after updating to Mojave, which has updated my firmware too. Didn't happened before till this OS update. Now it happens even when I downgraded back to High Sierra, so this is something related to the firmware upgrade. Probably something they added to avoid throttling on i9's or even to get more power to the CPUs. Problem is that this has a negative impact here.
     
  24. ari_ra macrumors newbie

    ari_ra

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    Mar 4, 2019
    Location:
    berlin / the world
    #24
    hi, can anyone of you guys confirm the 87watt power supply is correctly registered as such? mine is registered as per 60 wattage (system report --> power), which is odd. i do my 3d renderings on the machine, on the go, and the battery constantly just drains, which is annoying.
     
  25. ShapeCZ macrumors newbie

    Joined:
    Apr 7, 2019
    #25
    Look at my screenshot. I am using this charger of AliExpress: http://s.click.aliexpress.com/e/cOWr7BLE
    My MacBook Pro 2017 higher version is in a screenshot as well.

    I thought I'm having this problem as this charger might not supply the full 87W as the original charger. But now I see we are all having the same problem! I'm mad at Apple for this terrible mistake.
    ari_ra, which charger are you using? The Apple's original 87W that came with it?

    Anybody has a solution? I want a charger that will charge the battery or at least keep it charged at an intensive load. I started a game called Kingdom Come in Windows. After 60 minutes, I lost 20%. It wasn't even fully loaded!

    When I have a low battery, I can't load the computer. When I need to leave and have it charged fully, it might not be.

    It puts excessive and unneeded wear on the battery. Shame on you, Apple!
     

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28 August 29, 2018