I was one of the early recipients so I've been using the Incredible for a week already. Here are my findings on battery life and opening to further suggestions to stretch this out some more.
I am using the standard battery that came with the phone. I have a wall charger at my desk at work and a car charger in my car, all in addition to the charger on my night-stand. Fortunately these carried over from my Omnia2 since they are Micro USB. However, I have to use these constantly.
I have been using a smartphone for quite a few years and this one is by far the best yet... however, it also bleeds the battery dry like any other smartphone. I am also a power user, Exchange connection for work calendar and mail, Gmail, internet use and Facebook app. I also use the camera a lot, which yields impressive photos for a phone.
Average day for me; if I unplug the charger at about 7:00am as I leave for work and do not plug it into anything for power, the battery bar turns orange at about 2:30-3:00PM. I use Advanced Task Manager to kill things I don't use and have removed apps I had installed but use minimally which start up on their own (Skype, Photoshop Mobile... etc.). I also keep an eye on the running services to ensure the minimum is running at any given time.
Before I used Advanced Task Manager I was getting to about noon before the battery bar turned orange.
With occasional use of wall and car charger I can get through a full day before I get to red and the "plug into power" warning message. This past weekend I bled it to the point that it turned off on it's own, which was about 10:00PM
I typically have 2+ bars of 3G in my area, at home I have a signal extender so I have full strength signal, if that is off I have 1 bar of 1x.
Anyone have additional tips or tricks on how to milk even more battery life out of my Incredible phone? I expected lackluster battery performance but would love to get through a day without having to keep a charger on me.