Last month Ellen Williams, the director of ARPA-E, the U.S. Department of Energy’s advanced research program for alternative energy, made headlines when she told the Guardian newspaper that “We have reached some holy grails in batteries.” Despite very promising results from the 75-odd energy-storage research projects that ARPA-E funds, however, the grail of compact, low-cost energy storage remains elusive.

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We have better battery technologies, but not better batteries. Here’s why was originally published on iSeeTech

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