Our regular mechanic told me the hybrid battery in our 2007 Prius needed replacement and said it would cost $4,000 at the dealer. This was on a Thursday. I called the Hybrid Geek on Friday. Simon was very responsive and helpful also. Peter came out to our house on Saturday (!), confirmed the diagnosis and had the new battery installed within an hour-forr under $1500. The battery has a 5 year warranty but if I get 2 more years out of the Prius I'll be happy.