I am using debian(9.8 (stretch)) with cinnamon(3.2.7-4) interface and have problem with my battery. When battery is low I have no alert about that. Laptop just turns off unexpectedly (I can turn it on again and see all applications that were up and running, and all tabs in my browser but cannot do anything and after a few minutes laptop restarts so session is completely lost). Is there a tool which would inform me that I should charge my battery immediately? Preferably with alarm sound and option to set battery percentage which triggers such alarm.