Letting lithium battery go lower that that will kill the battery in a short time...
In any case, you should be able to block notification from the device manager if you go to the settings and find it, probably in the system apps....
No offense, but that's no help here. Just general knowledge, really.
I have the same bug on my Galaxy s6, just got it from the latest update in the last 2 or 3 days. This notification view is the full width of the screen and about half the length, placed right in the middle. There is no way to dismiss it or get rid of it except to:
1. Force power down if your device has a way to do this without using the screen.
2. Wait for your device to die.
3. Plug it in. This made it go away immediately, but isn't helpful if you're out and about without a charger.
It stays on the screen no matter what you do, even if you lock your phone.
I'm not sure if 1. really matters either, as I assume it'll just pop up again when you turn the phone back on with <25% battery. If anyone knows of a way of disabling this (I found no "device manager" in the notifications settings), or a better way of dealing with it, let me know!
Thanks.