Mine was running no foreground apps at all. Android not installed. No calls or SMS. WiFi, 3G and GPS are on. SysMon running in the background. Came off the charger about 1800. At 1930, the charge was down to 95%. That dropped to 94% while I was typing this post. This is the situation pretty much every day. I usually spend about two hours browsing in the evening and that gets me to about 50%. Sometimes less, very rarely more.