Its my first smartphone, I guess I better just get used to it? My env3 could go 3 days EZ mode.
What I tell everyone who converts to a smartphone is basically this: forget the days and days of battery life that you would get with a feature phone. Through various tweaks you can get 24+ hours, but generally speaking, plan on putting it on the charger at night.
What I also tell people too is that if you're a heavy user of it, plan on having a charger with you (or at least in your car) at all times. My wife is a good one for draining her iPhone 4 in 12 hours because of all the games and media she plays on it.
As another example too, Monday I had to charge my DINC2 twice. Why? My 3 year old and I were on marathon Angry Bird binges. (Neither charge were full charges though, about 40 minutes on the car charger.) Normally, with my regular use, I can get 18-24 hours easily. If I really take it easy, I could probably push 30-40 hours. With the extended battery, I'm not sure what I could do, but it would be pretty significant. But then I defeat the purpose of a smartphone.