now that we have all these cool graphic-intensive games, how long will it be before the batteries quit? i know my Touch starts to get warm if ive been playing Crash for a while. [it would also be nice to see the actual charge levels while playing to know when to quit and connect it back up] also, if [well, when] the battery does die an unfortunate death, how easy/hard will it be to get a new battery? and how much $$? anyone know?