Unfortunately Hyundai is not required by law to keep making batteries. They are only legally required to provide for warranty support for up to 10 years after a car is made. Usually that means you keep making parts, but I'm not sure how this works with EVs.

But the window is 10 years. After that, you rely on market forces -- if there is a profit to be made from making the part, then it is made. Heavily cars rely on aftermarket parts, but the question of a battery is a bit different.

Again, we need open source cars, with open source designs, so that batteries can be repaired, upgraded, and replaced by an aftermarket. I keep pushing this and hope I'm not being tedious, but people are underestimating the risk to the consumer.