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tesla

During Tesla's (NASDAQ: TSLA  ) annual shareholder meeting earlier this year, CEO Elon Musk promised "a fairly exciting upgrade to the Roadster." On Friday, Tesla finally revealed what Musk was referring to: an upgrade that can boost the Roadster's all-electric range from 245 miles to around 400 miles. 

Image: Tesla's Lotus-inspired Roadster. Image source: Tesla Motors.