Different kind of batteries though. The starting battery in your car is a very old lead acid technology and used hard and not really maintained well compared to a smart battery charger.
But WRT hybrid car batteries the big issue isn't having to replace it after warranty, its the size and cost of the job.
Any vehicle I've owned I could rebuild an engine or transmission for under $1000 should it completely die but to replace the battery pack in a hybrid is a major expense which will probably be more than the blue book value of the car.