Add a way to choose the low/critical battery level alerts

## Prerequisites
- [X] I have searched open and closed issues for duplicates.

## Feature

Currently there is no option to control battery level alerts. If I'm right there is a low battery level notification at 15% or 10% and a very low / critical battery level notification at 5%

**Describe the solution you'd like**

It would be great to have an option to choose the battery level alerts. I would personally set up something like 20% for low battery level and 10 % for critical.

**Existing work**

This feature exists on Windows. Don't know it it's available in other Linux distributions.