Why Deutsche Bank's Emmanuel Rosner upgrades Tesla after Battery Day

Emmanuel Rosner of Deutsche Bank and Rajvindra Gil of Needham join "Squawk on the Street" to discuss his rating for Tesla after the company's Battery Day. We upgraded Tesla overnight on the back of 'Battery Day,' says Rosner. Remember that Tesla has been partnering with Panasonic, he says. And now they're taking it to another level by incorporating and doing their own manufacturing. I think it's a bold move, Rosner says.