Like I said, right after my ICS update, my battery has been depleting like crazy. I usually could last a full day with moderate use, but now I can't go more than 6 hours without a charge. I have two batteries, and both perform worse than they did on 2.3. Also, my data has been going on and off constantly and cannot keep a consistent connection. data speeds are slower as well, I'm getting around 1-2 Mb/s, where I use to get 5-7Mb/s. Also, something interesting has also been happening. For some reason, when I wake my phone it will say it is connecting to the sim card and will take about two minutes to reset. It will stay like this until I reset the phone. So I don't have any connection whatsoever. Well, at least my phone is a lot smoother.