I know there was talk at some point that the biggest battery killer is the phone looking for 4G when in a non-coverage area... on the existing stock 4G phones, is 4G something that can be turned off manually or does that require root?
Yes sir you can disable it and nope no root is required.
http://www.droidforums.net/forum/htc-thunderbolt/133752-disable-4g-3g.html
[URL]http://www.droidforums.net/forum/htc-thunderbolt/133237-method-disable-4g.html[/URL]