@balisingh, It's (probably) not the battery, but how the phone estimates the current charge level. The N900 has the same issue. You start with, say, 40% and turn on the flashlight for 20min. If you then look at the battery level (using battery-eye), you see it's dropped a lot, but then after a while it goes up again. The reason for this is BME (battery management entity), which does not report the actual battery percentage, but an "estimation", meaning that if you draw a lot of current for a while, it will *assume* that the battery has gone down by a certain amount. No idea if N9 uses BME though.