I am a realist. And speak from personsal experience.There speaks a true pessimist.
Anything can go wrong with any product. Although expensive, batteries appear to be one of the most reliable parts of modern cars. There are still plenty of 10 - 13 year old Tesla's driving around and I doubt that many have been fitted with new batteries.
And remember, 13 years ago when they were built, the technology was in many ways in it's infancy.
Regarding guarantees, they are pretty much the same world-wide.
I had a battery failure in my Panamera PHEV midway through the sixth year of ownership. With ~65k miles on the clock.
It took nine months for Porsche to approve and complete the repair.
The total cost of the repair exceeded the car's value. But Porsche were bound and determined to not buy the car back, thus ensuring a miserable experience for me and everyone else involved.
I do not believe that hope is a valid strategy.