On the Surface 2, Microsoft states "more than 10 hours" battery life. However, Microsoft won't do the same with the Surface Pro 2 and seem to do everything they can to avoid stating numbers of hours. Every article I found the battery life hours are not stated in any way other than saying it is X% more than before. They like to say "75% more" or simply "'longer' battery life." [video=youtube;TJLY4Cgk18U]https://www.youtube.com/watch?v=TJLY4Cgk18U&noredirect=1[/video] Does anyone know why this is? They don't have any problem clearly stating 10+ hours for the Surface 2. How much battery life can expected in the Surface Pro 2 in a range of hours rather than percentages more than the original Surface Pro? How many total hours can be expected on the Surface Pro 2 with the extended battery keyboard?