I would agree with your numbers, but I would like to point out that different uses of the phone can use more energy than other uses. This would tend to reduce

I would agree with your numbers, but I would like to point out that different uses of the phone can use more energy than other uses. This would tend to reduce the number of overall days of usable battery. Think video recording, video editing, or heavy video playback apps. These are huge drains on the battery.