Render-Q

If you only have one computer, Render-Q (Render > Render-Q > Launch/Open) is the tool you should use to batch render. You can choose scenes from different content directories, change their priority and Bake Radiosity for a selection of scenes if needed. Remember, the scenes will render as you have set them so make sure all the details are right by first loading each scene, checking paths and save options to be sure that your computer will be able to chain the scenes together for continuous rendering.