This app provides a view into the power levels of your android device. It displays the total charge of your battery, the current charge, the current, voltage, temperature etc. In addition, it captures the rough time taken to charge your device along with a graph of the charge % versus time taken. Since this is not a service, the app works only when it is explicitly run by the user. I would also advise the user to turn the app off when the analysis is not required.