I know that for a given profile, there are options for what to do on battery VS plugged in but what I don't see is how to switch the profiles themselves depending on if your on battery on not. I think all the reviews have been using the "Balanced" profile because that shows an estimated battery life of 2-4 hours. When I switch mine to Power Saver, I've gotten estimated run times of up to 9 hours and while I haven't tested to see exactly how long it will last, it certainly seems like it should last 5-6 hours easy.