Hmmm, In Japan and Europe there is a button that makes the Prius "battery only" yet that feature is not implimented here. Hmmm, one can order the part if you have a friend in Japan or Europe, apparently, Priuschat has a post on how to install it on US cars, Seems to me that if all you have to do is add a switch, then the fried battery service guy needs a new job, like a used car salesman.

Next time I'm near my dealer I'm going to drop in and ask.