1

By default the notification for low battery is at 10%

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The critically low notification is at about 3% and the imminent shutdown notification comes immediately after. I find these levels to be too low.

Can they be changed somehow?

2

According to this answer:

Low and critical battery percentage is now handled by UPower and not by gsettings (more here). Instead of using gsettings, you should now edit the file /etc/UPower/UPower.conf

Using gedit text editor:

sudo gedit /etc/UPower/UPower.conf

Edit the following lines:

UsePercentageForPolicy=true
PercentageLow=15
PercentageCritical=10
PercentageAction=8

enter image description here

And the rest changed accordingly.

Only the setting for the action after critical level (line CriticalPowerAction=HybridSleep) didn't work until I have created a swap space.

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