If your battery is “critically low” in Windows 10, you get about 45 seconds before it will automatically shut down “for your own good.” Well, if you have a computer with a bad battery, your computer is now perpetually in the state of having a critically low battery. AND should you want to change this setting, you’d better hope you have another computer around to research the fix, because once again, you have 30-45 seconds to fix it. And then you restart and try again. And again. And again.
There is also no option in Power Options > Advanced settings > Battery to tell it to do nothing when it’s critically low. The only options are Sleep, Shutdown or Hibernate. Critical battery level also cannot be set to 0%.