Until you steam a video or play a game, like Civilization or XCom (from 2012). Then the battery just dies at a near 1% per minute rate. "Great battery! ... until you actually go to do something that uses power." I did a side by side test and the battery on my new MBP lasts the same as my 2013 MBP for streaming conference calls -- under 2 hours for both. (I had them call each other with cameras aimed at each other while both streaming Netflix.)