I'm noticing the same thing. In the past, after an OS update, I could count on battery life settling in to a reasonable discharge rate within a few days to a week. However, I'm noticing mine is actually getting a little worse than immediately after the update, instead of better; not a lot worse, but noticeable. It was never as good as pre-update, but now I also can't make it through the day on a single charge. And, like you, I also bought the G2 in part due to the battery life. Very unhappy with this "upgrade".