I found myself unable to start my Prius one cold morning. It seems that the battery had lost it’s charge. I decided to read the owners manual…I was luck to have one that came with this used car. I had an old battery that still had some life in it and so I decided it was time to put my reading to the test. Well it worked just as I suspected. Remember it you jump start your Prius to connect the negative battery cable last and connect it to a good ground other than the battery. A shock tower bolt might be a good ground.