In a letter sent to investors and analysts on Tuesday, the electric car company said it will announce a "home battery" and a "very large utility scale battery." Similar products already exist on the market, but Tesla said it will explain why its batteries are better than competitors' solutions at the event. CEO Elon Musk thinks rivals' batteries "suck," according to the note from Jeff Evanson, Tesla's investor relations director.
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http://money.cnn.com/2015/04/22/technology/tesla-home-battery/index.html?iid=HP_LN
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