The battery lasted about 3.5 hours under heavy photo and video use. I probably shot 25 minutes of video, 50 photos, and did 5 minutes of video play back. Not bad!
As far as skiing with Glass…probably won't do it again. The eye piece is too invasive. I need unrestricted vision when skiing. I suspect that Google will partner with optics manufacturers that will accommodate the Glass computing and optics modules. If they did that, I would use them for sports instead of my GoPro. Phone, compass, weather, camera, Strava all in one heads up display.