Are Manufacturers Better Off Taking Everything in House?

Do any e v manufacturers actually make their own batteries? Yesa tesca makes its own. For gong norse in partnership with panasonic. In southern china, c a t l and b y d. There there's an increasing interest in doing manufacturing in europe,. Some here in the mericas as well. And it's very highly concentrated at the moment, given that so much of this a capability is in east asia. But i want to go back to this question of what becomes of an auto maker's identity in ana sort of evi orld.