So, I've had my macbook 13.3 unibody for about 2 months, and lately I've noticed a huge drop in battery life. I started with being able to have 3 - 5 hours of continuous battery. But now at full charge I get 1 1/2 - 2 hours continuous. Anyone have any ideas about what to do? I've looked for applications that help reduce energy uses, but I haven'f found anything. Please help.