Charging ahead: Tesla teases big news on 'Battery Day'

San Francisco (AFP) – Tesla chief Elon Musk has promised “insane” battery news at a streamed event after the company’s annual shareholders’ meeting on Tuesday.Speculation includes that Tesla will announce it has come up with ways to pack more energy into battery cells, slash production cost and dramatically extend battery life.Musk, however, seemed to tap the brakes a bit on expectations in a tweet Monday, saying announcements will affect long-term production, particularly of Tesla’s Semi, Cybertruck and Roadster models.Innovations will not reach “serious high-volume production” until the year…

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