A bit shy of two years ago, battery startup Envia Systems looked quite promising. The Silicon Valley company had produced a 400-watt-hours-per-kilogram lithium ion battery and claimed it could be placed inside an electric car that would cost $20,000 and be able to travel 300 miles on one charge. It was enough to bring in millions of dollars in funding from the US Department of Energy's APRA-E program, the California Energy Commission and General Motors. This all appears to be in trouble now.
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