I was sleeping the moment the charger was connected, so I counted until I put it on the charger : so from left to right until the charger 15+10+30+25+55+55+55 = > four hours, but yes I didn't include the screen off time. Anyways that doesn't bad as usually it would have drained about 70% as you can see in my last ten days picture.Did you add up the individual bars in the chart because that is what I estimated based on? If you are going by the screen-on and screen-off times, that includes on the charger and is a moving 3 hour window. And screen-off times need to be included as that also uses battery.