How to know how much battery in terms of hours and minutes is left on my phone? I want to know the remaining time of my cell phone battery. Android only gives me how much battery in terms of percentage has been consumed since the last charging. 

However, what I want is to know how much more time I have before my phone goes off? How can I get that information?
Battery Indicator Pro or a similar alternative might help. In addition to showing the remaining battery in numbers, it also tries to "guesstimate" the remaining minutes, depending on light/medium/heavy usage.