Hmm. In your position I would first monitor battery depletion in idle state to check that there is no runaway processes. Power search for tens of threads about battery issues. Mostly those are about some testing/devel stuff installed and user who doesn´t understand what they are doing. The case you are describing "downloading 1Gb of movie and surfing all day" sounds just weird. NONE of current hand held devices manage to do that. Your usage case is pure extreme, but gives nice scientific stuff to power users of TMO. And after all Screen brightness is the biggest consumer of energy. But good thing that new battery gives you longer runtime. Please remember that wear level of batteries in handheld devices kicks in quite quickly when you charge it daily. Or was you battery like that from day 1 after PR1.3?