I noticed the phoen gets warm from time to time, I am not sure if it is an unbehaved app or what, but then it cools down eventually. As for battery I fully charged the battery and left on charger for a few hours then ran Battery Calibrator (you need to be rooted) and then fully ran battery down and fully charged for 8 hours. Di it one more time and I find my battery life to be very good now. AS with many of these devices the display is you biggest enemy for battery life. But on standby I can easily go 8+ hours with a few calls and minimal text/e-mail use. My accounts sync every 30 minutes.