Sup zrxoa1. I know you probably don't want to root since you're close to taking the phone back and all but that would be my suggestion. Getting rid of all the Verizon stuff on there would probably go a long way to helping your battery life.
It's really not that difficult to unlock and get rooted but like I said, I know you're probably ready to take it back. If you do go for it (rooting that is) I'd recommend scott's CleanROM 1.6.5 (version may be newer by now, that's the version I ran about a month ago) It's a great ROM, about as close to stock as you can get, gets great battery life, and frees you from Verizon's death gripe of bloatware.
At any rate, consider it.