About 14 percent of the Gigafactory in Nevada has been built so far. At 5.8 million square feet, it will be a building with one of the biggest footprints in the world. Tesla hide caption

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A Rare Look Inside The 'Gigafactory' Tesla Hopes Will Revolutionize Energy Use

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The plastic sheet invented by Stanford University chemical engineer Zhenan Bao and her colleagues can be inserted in lithium-ion batteries to avoid overheating. Zheng Chen/Courtesy of Zhenan Bao hide caption

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Batteries With A Less Fiery Future

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Jim and Lyn Schneider installed solar panels and batteries because bringing grid power to their house in central Wyoming was going to cost around $80,000. Leigh Paterson/Wyoming Public Radio hide caption

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When Relying On The Sun, Energy Storage Remains Out Of Reach

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Smart watches based on Qualcomm chipsets are displayed at CES — but do consumers want them? Jae C. Hong/AP hide caption

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Forget Wearable Tech. People Really Want Better Batteries.

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A prototype of a flexible battery from Imprint Energy, one of 40 companies working on battery technology in the San Francisco Bay Area. Imprint Energy hide caption

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Electric Cars Drive Demand For Cheaper, More Powerful Batteries

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Electric Car Review Dust-Up May Put Brakes On Tesla Profits

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