When I bought my MBA - shipped straight from Shanghai in early August - I was blown away by the 11-13 hours of battery life I was getting from it. Now, after only 1.5 months, with the same activities, I barely pull 8 hours - full brightness, running nothing but Safari . Is this happening to anyone else? 8 hours is still respectable, but not after the promised 12. Is my battery failing, or should I check something else? Is this happening to anyone else?