I don't see how that's even remotely comparable. It's not like you can replace the battery in your phone with a larger one. You will be able to buy a new battery for your car, that's already guaranteed in the EU - but it will be the same capacity as what you got.

I don't know why is this even an argument really, like.....in a petrol car, do you expect to be able to fit it with a bigger fuel tank after 10 years? or a more powerful engine? Until very recently even software updates to the infotainment weren't really a thing, if you wanted a newer interface you had to change the entire car(I'm not saying this was a good thing, just that generally the expectation is that the product will work the way it was when you bought it).