[carlosruizano]

I haven't tried checking to see if mine is GSM or CDMA only, but I did one other thing. In the past every time I got a new WM device I would always change the network to "Sprint only". I haven't really seen this suggested before. I am new to Android so I don't know if this would help. Here is how you change it:

Settings>Wireless & networks>Mobile network>Roaming>Sprint only.

Factory settings are always set to Automatic which means in low coverage it will be jumping from Sprint to Roaming which consumes battery. Note that after this change you will not be able to roam.
Also right above the Roaming setting there is an "Enable always-on mobile data" setting, and there is a note under there that says it may use more power.
My battery level so far is at 48% after 6hrs 25m and I have been browsing throughout the day.