I've had my Inc2 for about a week and I can only tell you what worked for me. On the first day, battery life was horrible (yes, after charging it).
I went to menu/settings/about phone/battery/battery use, and saw at the top of the list something called "PVMtpServiceStart", eating my battery like it had gravy on it or something.
I tried all the suggestions for improving battery performance, but the only thing that worked (and worked like a charm) was doing a factory reset. I'm glad I did it before I loaded all kinds of apps or anything, but the apps I had loaded were there after the reset anyway. Since then, this battery has been crazy good with moderate use. I also keep the wifi on when I'm at home, and only switch to 3G on the road.
That's my own experience so far....others will be different, I'm sure, but I love this phone so far. And it works great as a...*gasp*...phone, too!