After some initial battery testing today, I can report that the battery life is very good for the Mini 4 1 hour of Netfix with the screen at 50% volume at 75% and location services on yielded only a 7% per hour loss. That is almost exactly what my IPad 3 does in the same performance test. My iPad 3 tablet is the gold standard of which I judge all other tablets by in battery life. My Galaxy Tab S with every battery saver method activated looses 15.3% per hour. So I would conclude that 10+ hours of web streaming Netflix is what the iPad Mini 4 will do.