16 hours unplugged. Screen brightness is at 30%. 3 1/2 hours screen on time, it was probably just over 4 hours by the time I plugged it in, as I took this screen shot when it hit 14%. I had wifi connectivity 70% of the time, which is the biggest factor with battery life on this phone. If i'm connected to 3g/4g, I usually get 2 hours of screen on time.