Windows 8 and 8.1 Forums


Cannot lower Critical Battery Level in Power Options

  1. #11


    Posts : 11
    Windows 8.1


    Thanks for the suggestions adamf. The key numbers correspond exactly with the ones in Windows 8.1 on my machine. It appears that changing the registry entries is the same as using powercfg from the command prompt.

    I edited the appropriate registry keys and it seems that the change is purely cosmetic - I can verify that when I edit the registry key to 3%, the setting in Power Options says 3% also. The strange thing is that if I use Power Options to try to change it to anything from 0% to 6%, it now jumps back automatically to 3% (because that is what the registry key is set to). However, even more strange is that I can use Power Options to change it to anything from 7% and above (and the registry value updates with it).

    I say that the change is purely cosmetic because I tested it out by running the laptop after changing the registry entry to 3%. I couldn't even get the laptop to run down that low because the blasted thing still insisted on shutting down at 7%, despite the registry saying otherwise!!!

    I have to mention that I did take ownership of the registry key as suggested. I tried numerous combinations of owners/permission levels (System/Administrators/User) and it's still the same story.

    It appears HP has somehow locked down this 7% limit somewhere. I have faith that if HP can lock it down, there must be a way to unlock it.

    I haven't given up on HP support yet. I just need to wait until Tuesday now for a response from them (something to do with what happened to some guy more than 2 millennia ago....but I digress

    Thinking I might need to take drastic action by formatting the entire thing and installing a different copy of Windows.

    Happy Easter folks

      My System SpecsSystem Spec

  2. #12


    Central IL
    Posts : 3,468
    Linux Mint 17.2


    Quote Originally Posted by segap21 View Post
    That's rather confusing. I mean no disrespect but I thought this was a Windows forum to discuss general support issues relating to Windows. As I mentioned before, I just want to set the critical battery level to something more reasonable than 7%. I think that should be achievable since adamf can do exactly that.

    Hoping that someone can shed some more light on this.
    Just because a person does not use Windows on their computer, does not mean they do not know a thing or two. I just opted to not run Windows 8, just like a few thousand plus others.
      My System SpecsSystem Spec

  3. #13


    Posts : 11
    Windows 8.1


    Quote Originally Posted by broe23 View Post
    Just because a person does not use Windows on their computer, does not mean they do not know a thing or two. I just opted to not run Windows 8, just like a few thousand plus others.
    Exactly, and this is beside the point.

    What is more relevant is do you know how to fix the issue at hand?

    All you have suggested to me so far is that it is unwise to run the battery completely flat (which I acknowledged already) and that the setting is coded into Windows to not allow anything lower (which turns out not to be entirely correct).

    I'm open to any further suggestions on how to fix this so I can choose my own Critical Battery Level in Windows, and not be dictated by what HP thinks.
      My System SpecsSystem Spec

  4. #14


    Central IL
    Posts : 3,468
    Linux Mint 17.2


    As has already been stated over and over, you cannot. It is coded into the AHCI driver to not allow you to completely drain the battery, so it becomes a door stop after a couple of times running it all of the way down.
      My System SpecsSystem Spec

  5. #15


    Posts : 1,875
    Windows 10 Pro Prieview x64


    Quote Originally Posted by segap21 View Post
    Thinking I might need to take drastic action by formatting the entire thing and installing a different copy of Windows
    You could try that but I don't know if it would work. My problem is I run Windows on a MacBook Pro which is one of the models that your original link said worked so it is difficult for me to test (well impossible really).

    Rather randomly I was reading a few weeks ago about hacking the firmware on MacBook batteries (resetting maximum and minimum voltage levels, changing cycle counts and so on) to see if you could make the battery catch on fire by flashing the firmware. The answer was theoretically yes but in practice it was too complicated.

    Certainly the chip in the battery does a lot of work and can override whatever you may choose to do to it from outside so I don't know if replacing your OS would help. It would not work on a MacBook battery - on a HP battery I'm beyond clueless.

    You could try changing - do a backup and then just install Windows 10 or something and see if it helps. It's free so why not if you have the time.

    Maybe someone else (a helpful person ideally) will see if they can change their critical discharge limit or not - seems you've had enough opinions about whether you should
      My System SpecsSystem Spec

  6. #16


    Posts : 1,875
    Windows 10 Pro Prieview x64


    Quote Originally Posted by broe23 View Post
    As has already been stated over and over, you cannot. It is coded into the AHCI driver to not allow you to completely drain the battery, so it becomes a door stop after a couple of times running it all of the way down.
    Helpful comment
      My System SpecsSystem Spec

  7. #17


    Central IL
    Posts : 3,468
    Linux Mint 17.2


    Even in Mac OS & Linux. You can only go to 1%. It is done so a person does not burn out the LiON salts in the battery.
      My System SpecsSystem Spec

  8. #18


    Posts : 11
    Windows 8.1


    Quote Originally Posted by broe23 View Post
    It is coded into the AHCI driver to not allow you to completely drain the battery, so it becomes a door stop after a couple of times running it all of the way down.
    I do not follow how AHCI drivers affect the battery settings. I thought AHCI drivers were to do with how data is exchanged between system memory and attached storage devices?
      My System SpecsSystem Spec

  9. #19


    Posts : 11
    Windows 8.1


    Quote Originally Posted by adamf View Post
    You could try changing - do a backup and then just install Windows 10 or something and see if it helps. It's free so why not if you have the time.
    Yeah, looks like I will give this a go if I can't find an alternative solution soon.

    In the meantime, calling all Windows 8.1 users who just happen to be reading this post but may not have a solution - could you please have a look at your Power Options and see if you can change the Critical Battery Level downwards. You do not have to test it further by running your laptop till it dies; if you could just see if the setting will stick and report back it will be much appreciated.
      My System SpecsSystem Spec

  10. #20


    Posts : 1,875
    Windows 10 Pro Prieview x64


    Quote Originally Posted by segap21 View Post
    I do not follow how AHCI drivers affect the battery settings. I thought AHCI drivers were to do with how data is exchanged between system memory and attached storage devices?
    Life is hard with all these acronymes How about you try ACPI? Windows Dev Centre Hardware
    Quote Originally Posted by Microsoft
    Design capacity of Low Indicates the critical battery level at which Windows must immediately shut down or hibernate before the system powers off. Must be set to a value between 0 and 5 percent of the battery design capacity
    Now if you are saying HP batteries are not conforming to Microsoft specifications there isn't really much more to do than take it up with them as
    Quote Originally Posted by Microsoft
    Windows platforms are expected to expose their battery devices and AC adapters in firmware through ACPI by using standardized control method interfaces, as described in the ACPI 5.0 specification.
      My System SpecsSystem Spec

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Cannot lower Critical Battery Level in Power Options
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