At least this application actually boots, unlike decrepit old X-Charge. But sadly that is all it is good for. None of the readings say anything. It has the name of my PowerBook wrong (although the fact that I tossed a G4 500 MHz into the PB may confuse it), thinks I am plugged in when I am not, and tells me absolutely nothing about my battery. I might as well not have one. Use iBatt and XBattery. The fact that these alternatives actually work great prevents me from having a guilty conscience about giving this thing one star.