(More expensive versions of the Roomba include a "home base" for charging, and the vacuum will automatically return to the base when the battery is low.
Happily, Henry has proved everyone to be wrong, making his more harsh critics look like fools. Most of the time, that's not going to be a problem, and Using the 20 foot cord; it's not likely you'll ever run in to a circumstance where you can't reach what you want to clean up.
