Tesla's secret product is likely to be home battery units

March 31, 2015 5:15 PM

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Security guards stop a car at the gate to the site Tahoe Reno Industrial Center about 15 miles east of Reno, Nevada where Tesla Motors has broken ground on a $5 billion ““Gigafactory” to make lithium batteries for its electric cars. (AP Photo/Scott Sonner)

After all, Tesla (TSLA) rarely disappoints when it comes to fanfare, even if the subject of the announcement doesn’t exactly light up investors or owners of its electric cars.

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