The Charge's battery is great. I have been fooling around with it for a couple days now, I generally run my phones through some pretty rigorous battery tests in the first week or so to see if it can handle what I want from it. The battery life has gotten consistently better each day; I've worked it down to almost dead and then charged overnight.
I live in a 4G area so I'm running the 4G LTE radio (switching to CDMA will probably get you even more juice) and have been unplugged for 16 hours, and I am around 15 percent battery life. I talked on the phone for 15 minutes, did a fair amount of web browsing, sent some emails, a whole mess of texts, took 5-10 minutes of video, and 30 minutes of various apps, and 15 minutes using GPS navigation. For the past 8 hours the phone's been set to auto sync, just because I want to see how fast it drains the battery.
The 1600 mAh battery on this is good enough that you can get through the day and still a decent amount of wiggle room in terms of settings. You can get a Thunderbolt through the day as well, but I hate feeling like I'm sparring with the battery. Turn the screen brightness down, turn off navigation and wifi if you're not using them, set apps you use infrequently to update either every hour, or even less often, things of that nature and you won't even have to worry about getting through the day without a charger. Great phone, great battery life.