The only thing this app provides in addition, is an estimate of how long the battery lasts still. This indicator, however, is useless, because they erratic jumps back and forth and is very inaccurate. I used to have another app that looked much better, more information provided, the own device calibrated and in the remaining time of batteries for various usage scenarios differed (about MP3 playback, surfing or video). And this app was free.
What exactly should you pay for Battery Pro so?