Just a heads up, I've been running pancake now for a few days and loving it. I loaded the stock pancake ROM with all the Sprint Apps included. I then removed Nascar, Twitter and one other thing I can't think of. The speed and battery life has been good.
40 hrs of use so far and I'm down to 40%. This includes a few phone calls (not more than 5 mins long), web surfing, downloading a few documents to review, facebook, a half dozen text messages and several emails (gmail). In other words, not a great deal of heavy use - I'd say average to low.
No WiFi, bluetooth used only a few times and location services turned on. No GPS. I have no doubt I could make it the full 48 hours with life to spare.
Many thanks to bikcmp for this rom and everyone who's contributed to this forum as well as xda.