1) im not sure about your uni, but for unsw, my lecturers usually put up notes on webct, so i use those ntoes to summarise, but for those that dont put up notes, you have to turn up to lectures, an by the end of the semester, youll have a whole stack of notes to summarise, so this is where the notebook comes in
much more efficient and wastes less time than writing
2) in classrooms there are, but for lecture theatres usually not
they only last 1-2 hrs so just charge it at the library or something afterwards