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Flow batteries aren't new, but they haven't succeeded commercially because they are so expensive.
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These batteries are called flow batteries.
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A123 now has cash flow problems and those flow from two facts: the market for electric vehicles that use its batteries is much smaller than anticipated.
FORBES: Is A123 Electric Battery A Waste of $263 Million in Government Funds?
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One promising flow battery type is called a vanadium redox battery, and the way it works sheds some light on why these batteries can last so long.
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