Elon Musk announced his new company xAI which he says has the goal to understand the true nature of the universe. Tesla sold $430 million worth of its giant backup batteries called Megapacks to xAI, Elon Musk's artificial intelligence startup, in 2025, according to a filing on Thursday. In its fourth-quarter earnings release on Wednesday, Tesla said it was investing $2 billion in xAI as part of the startup's latest round of funding. In a lawsuit that's pending in Delaware, Musk has been accused of violating his fiduciary duty to Tesla shareholders by diverting the automaker's resources to xAI. WATCH: Musk's xAI closes $20 billion funding round