I'm seeing the same problem with battery life after the 2.3.6 update, which came in on Monday Dec 19. Previously I could go a full 2 days between charges if my usage was light, now I can barely make it through 1. All settings are the same as far as I can tell. Yesterday I tried going an entire day using the phone as little as possible, and by the evening my battery was at 30% and Android OS had used 93% of the total... I don't think it could be the display since I wasn't using it. With normal use, I can't even make it through the day without a charge now. This isn't an acceptable situation for me... I'm really hoping someone can suggest what's gone wrong. I'll keep experimenting to see what I can figure out, but I'm rather new to Android (the Galaxy S2 is my first, got it in October). Is there a way to look at CPU usage of individual tasks, similar to the task manager on Windows?