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
Frozen Grey, Silverstone Full Merino, Piano Black, Exec Pkg, Drivers assistance pkg, LED Package, Bang and Olufsen, 20" Forged wheels