By , , Tesla’s market cap dropped $20 billion in just two hours after trading closed Tuesday, as Musk and other Tesla executives presented their new battery and manufacturing strategies. Shares closed down 5.6% and dropped another 6.9% after hours.“Nothing Musk discussed about batteries is a done deal,” said Roth Capital Partners analyst Craig Irwin. “There was nothing tangible.”Investors had expected two significant announcements at Musk’s oft-touted “Battery Day”: The development of a “million mile” battery good for 10 years or more, and a specific cost reduction target -- expressed in...…By , , Tesla’s market cap dropped $20 billion in just two hours after trading closed Tuesday, as Musk and other Tesla executives presented their new battery and manufacturing strategies. Shares closed down 5.6% and dropped another 6.9% after hours.“Nothing Musk discussed about batteries is a done deal,” said Roth Capital Partners analyst Craig Irwin. “There was nothing tangible.”Investors had expected two significant announcements at Musk’s oft-touted “Battery Day”: The development of a “million mile” battery good for 10 years or more, and a specific cost reduction target -- expressed in...WW…