I've got an entry level unibody macbook, just the 13" one, and I consistently get between 4 and 5 hours battery life. This is browsing and development using net

I've got an entry level unibody macbook, just the 13" one, and I consistently get between 4 and 5 hours battery life. This is browsing and development using netbeans (not the most lightweight ide ever designed). For lighter use I'll occasionally see 6+ hours, but that's often when I'm doing something else at the same time.