If you set up Advanced Task Killer right, it doubles the battery life of your Evo. That's what I have figured out this week. My phone wouldn't make it past 9pm and now it regularly goes all day and all night with no problem. I set it to ignore important things like the clock or Smart Keyboard, and my phone literally doubled in battery life. I have it set to do a 'kill' once an hour. Seems to do the trick. I think the reason for this working is all the shit Sprint puts on the phone to begin with. I constantly see Amazon MP3, Sprint Navigation and NASCAR running in the background: 3 apps I wish I didn't have. Why make such a killer phone who's obvious Achilles heel is battery life, when it could be so much better and give Android a good name when it comes to battery life.