https://www.reuters.com/article/us-tesla-batteryday/after-much-hype-from-elon-musk-teslas-battery-day-kicks-off-idUSKCN26D19P

Tesla Inc CEO Elon Musk fired up fans and investors for the company's "Battery Day" on Tuesday, even as he tempered expectations that Tesla's electric vehicles will soon surpass the cost and convenience of traditional gasoline-powered cars.