8h30m is still pretty nice. (Most of the time I only need to do one thing at a time)
In fact, I notice you have excel open. How do you manage to get more than 2h battery?

I avoid non Safari browsers, purely so I can get more battery life, I'd rather forgo the benefits of the other browsers, as I don't see the added benefit of the features of chrome/Firefox when compared to the benefits of extended battery life.