Does your phone have an extreme battery saver setting that is supposed to be used when the battery gets too low?

msc545
Mine has such a setting and it is completely useless because if you turn on that setting it means the phone can't be used for basically anything. Maybe 911 but that would be about it. Do you use it or is there something I'm missing about it?
Does your phone have an extreme battery saver setting that is supposed to be used when the battery gets too low?
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