The growing appetite for electric cars has created a new technology arms race. Vehicle makers like Tesla Inc. and General Motors Co. and their suppliers are on the hunt for batteries that are better and cheaper. Here is what you need to know:

What should you expect from Tesla’s so-called Battery Day?

Tesla Chief Executive Elon Musk for months has been promising to host the event, which was delayed by the pandemic and now is set to kick off Sept. 22 in conjunction with Tesla’s annual shareholder meeting. He has dropped several…

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