I just downloded an app called "Green Power"...it controls the dataflow, similar to JD...I just installed it, so not sure it works yet, but i'm always game to try something proclaimed to help in the battery area!
I read a couple reviews (pretty scarce- new app?) but i'll run it for a coiple days to see...just an FYI incase you guys have/have not heard about it...if you have heard it is good, or sucks...please chime in