Jehu Garcia didn’t expect to be known for working with Lithium-ion batteries. The California-based YouTuber previously started a photography accessories company, and originally thought his life was more about cameras and making videos. “I didn’t want to be known as the battery guy,” Garcia told me on a recent phone call.

But then, in 2015, Elon Musk unveiled the Tesla Powerwall. The suitcase-sized battery lets homeowners store electricity, either from the grid or solar panels. The device represented an impressive step forward in alternative energy technology, but it started at $3,000 and could only store 10 KWh of electricity, or about a third the average American household consumes in a day.

 

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