25 minutes unplugged. Only use consisted of turning on the screen to check battery level/usage every 3-4 minutes. Display 31% Android system 20% SetCPU 14% Phone Idle 14% Standby 12% Like 3 things at < 4% Says 90%, but who knows how long it takes to get from 100-90, probably not very long. I will test from 90 to 80. Running very cool, 25*C. It was at 90% after ~15 minutes of being unplugged, but that might not be accurate. I'll probably the time when it hits 80% and subtract 15 minutes from it, giving me an accurate number after multiplying to determine the approximate life. Not looking good so far, though.