BUZZ-Ballard Power Systems: Signs China deal
** Canadian fuel cell maker's U.S.-listed shares up 6 percent at $4.40 premarket
** Ballard signs agreement with China's Azure Hydrogen to provide telecom backup power systems for Chinese market
** Deal valued at about $6 million over 2014-15
** Ballard to also be exclusive supplier of air-cooled fuel cell stacks and fuel processors
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