Bigger screen -> smaller battery life. Where're you, mitchellvii? Samsung's 3,200 x 1,800 ATIV Book 9 Plus listed for $1,400, shipping August 20th Samsung shipping ATIV Book 9 Plus and ATIV Tab 3 in the coming weeks, promises business-minded variants this fall Samsung undercuts Retina MacBook Pro with $1,399.99 Ativ Book 9 Plus | The Verge Back when the company first showed off the (horribly named) laptop in June it promised an excellent 12 hours of battery life, which would make the Ativ Book 9 Plus a mighty competitor to the much lower-resolution MacBook Air. In today's press release, however, Samsung has dropped that estimate to a far-less-impressive 7.5 hours, and on its website it's quoting 11 hours of battery life. It's not clear what's changed, and we've reached out to Samsung for more details.