A cool feature on the Android is it's Battery Use or consumption stats meter which tells you the distribution of apps that ate your cell battery.
It also shows a graph with battery power on the y axis and time on the x axis; so you know how much was spent when. Cool!
Then I thought that what if I had the option of viewing a derivative graph. This would tell me the rate and would make it a lot more easier to read the differential and slope values.Moreover, it would be very helpful and droidy :)