Mine is from the much lower-spec (and appropriately cheaper) ZenBook DUO range. The battery life is pretty darn good until I plug in the external screen, and st

Mine is from the much lower-spec (and appropriately cheaper) ZenBook DUO range. The battery life is pretty darn good until I plug in the external screen, and still better than many laptops even then. It isn't often I'm away from a power socket for and needing to work, but when I am, it can be for a fair few hours. Gaming isn't something I find time for these days, so this model is much better value for this use pattern.