Microsoft and all of the reviews I've read are raving about this device's battery performance, but my experience has been far below expectations. Yesterday I clocked 7.5 hours from 100% charge to depleted. This included about 2 hours of YouTube streaming, 2 hours of web browsing with Edge, and the rest of the time just sitting idle on the desktop. Some folks have suggested that the device takes some time to index its storage, which might affect battery. The device had spent about 6 hours idling prior to the test. I have the 256 GB / i7 / 8 GB model. I am not subscribed to insider updates, but it is otherwise up-to-date. What are your experiences with the Surface Book's battery life? Any suggestions for troubleshooting?