Elon Musk Dampens 'Battery Day' Enthusiasm on Twitter

Tesla will be charged up Tuesday afternoon as the company showcases its battery capabilities during the appropriately-called "Battery Day." But before you get too excited, CEO Elon Musk took to Twitter yesterday to manage some expectations, saying that the products being unveiled, quote, "will not reach serious high-volume production until 2022." Tesla's shares fell over 6% in after-hours trading on Monday and continued to plunge Tuesday as a result. Jon Swartz, Senior Writer for MarketWatch, explains why Musk's announcement was so devastating to investors.