It's easy to treat a notebook as you would a desktop, but if you adjust your way of working you can get more out of your battery when you're away from a power outlet.
But not all applications are created equally, and some suck on the battery more than others. Fortunately, OS X 10.9 Mavericks offers you a way to keep an eye on which apps are being kind on your battery, and which aren't.
The easiest way to keep an eye on things is to click on the battery icon in the menu bar. This will show you apps that are using significant amounts of energy.
If you want more details, you can click on any of the entries to bring up the Activity Monitor with the Energy option selected.
Here you get a fuller picture of what's consuming the most battery, giving you the option to close those apps when you want the maximum possible battery life.
For me, the Google Chrome browser almost always tops the list, and if I want the most from my battery I reluctantly make the switch to Safari.