I spent altogether about 15 hours away from the battery charger, today, as I took my daughter to NYC to go to the Met Museum and the NY Yankees game. We took the train in so I didn't have access to a car charger. I d/l switch pro widget, yesterday, because it was the only widget I'd found that can shut off 3g, like the Sense UI widget did when I had my Incredible. I have root, so I use setCPU to underclock when my battery goes under 20 percent. On the train ride home, it did underclock and I could tell as things were a bit laggy. I was undercloced to 300 mhz, so it sipped power. Basically, I left the phone connection on the entire time. I shut off 3g when I wasn't using it. When I wanted to check mail, I turned 3g on and did so, but I didn't leave it on. When I was in the NYC subway, I went into airplane mode as I didn't want to waste power having the phone search for telephone coverage/signal. I even did some light browsing. I did bring an extra fully charged DX battery with me, but I never used it! Managing power wisely, I got a full day out of this battery. I'm very encouraged about this.