That's interesting. I do know that there are Prius cars which are more than ten years old and very few of them have needed new batteries.
You should have done the test drive. It's fun and fascinating.
2013 ///M5 Individual Monte Carlo Blue, Platinum Full Individual Merino, Platinum Alcantara, Piano Black, Exec Pkg, Drivers assistance pkg, Bang and Olufsen, 20" wheels, Eisenmann Sport, STIR+, LI Quad HP