If my memory serves me correctly the price of the battery used to be much higher. It must have gone down in price and that's great to see. Hopefully, that will be the case with most of the other hybrid components or else these vehicles could prove to be a very costly endeavour for second or third hand owners. The Prius has been around for longer so I would gather that there must be a good deal of them which are out of the warranty period. If people aren't having issues quality wise with them, then perhaps we will be ok as well. Only time will tell how this will play out.