There were a lot of interesting announcements during Tesla's battery day. In spite of those, the stock reacted badly.

Elon Musk made big promises at Tesla’s highly anticipated event. But a prototype never appeared, and it was unclear what the company had actually achieved.

Tesla’s battery day left a lot of people with more questions than answers. Elon Musk announced Tesla would make its own batteries, process its own raw materials, and even mine its own lithium.

New battery developments will be critical to increase competitive advantage in the energy storage business.

After months of anticipation, Tesla's Battery Day event is finally in the books leaving investors with one simple question: did it live up to the expectations?

Ahead of Tesla’s much-hyped Battery Day event on Tuesday, expectations were high. Not only had CEO Elon Musk promised that “exciting things” would be unveiled at the “very insane” event ...

Tesla could release more updates to the two vehicle programs on Battery Day. We are hoping for Tesla’s long-delayed interior refresh, but that project has been delayed for over a year now.

Tesla is aiming to hold its upcoming “Battery Day,” along with its annual shareholder’s meeting, on September 15 — and it will include a “tour of cell production system.” Tesla Battery ...