Tesla's "Battery Day" Is a Dud; Stock Tumbles

Tesla's "Battery Day" Is a Dud; Stock Tumbles

Followers of Tesla (NASDAQ: TSLA) were eagerly anticipating the company's much-hyped "Battery Day" on Tuesday, expecting news of major developments in the electric-car maker's signature technology. In other words, the main reason "Battery Day" fell flat was that it didn't really improve the thesis for buying the stock.