After 1 week on ICS, I can say that battery life is still, IMO a disaster. I get nowhere near the 22 hours obtained by fellow forum members. Last battery change was after 7 hours. I either change batteries 3x per day, or recharge the thing 3x per day. Sigh.
I went to battery usage to see what ate so much power. To my surprise, the 3rd largest culprit was the Amazon Appstore (which I hadn't even opened). So that sucker got uninstalled today. The other 2 were the Android OS and Cell standby - both of which running at around 30%, which does not seem unreasonable to me.