Alright, upon doing more research regarding the 4Glte and 3g switch off will kill the battery. I found this on the XDA forums:
Go to the ThunderBolt's phone dialer. Enter ##778# and hit Send.
You'll get a pop-up labeled EPST, with the choice to "View Mode" or "Edit Mode." You want "Edit Mode."
You'll be asked for a password. It's 000000.
Now flip down to "Modem Settings," and then choose "Rev. A."
Change the setting from eHRPD to "Enable," hit OK, then press the Menu button on the phone and tap "Commit Modifications."
That's it. You're done. The phone will reboot (don't worry, you're not losing any data here), and things should, you know, actually work.
I have done this and for the past hour my phone has not lost any battery. Before it would have dropped minimum of 10%. I will leave this on my phone for tomorrow and get a real feel for it.