With "excellent execution," Tesla can become the "by far" the most valuable company in the world, CEO Elon Musk said.

But that's reportedly no longer the case. Tesla assembly line in Texas. Tesla Speaking to "two sources familiar with the matter," Reuters reports Tesla has abandoned plans to cast complete ...

She says this battery issue is more troubling than a simpler assembly line problem, and points out that the head of Tesla's director of battery engineering left to start his own company ...