Battery Time - Left Standby or Usage Time

Do not you wonder how much longer you can use the battery?

For example, I have 9% of my battery left,
How many more hours can I use?
Or how much more available if you turn off the screen without using it?

Estimate the time available when using / waiting for this app.
Every time you run this app, it analyzes the battery usage pattern.
The more you use, the higher the accuracy.