A123 System’s recent agreement with a Chinese conglomerate has spurred concerns that the Waltham battery maker could lose control of its technology and business, but some analysts say the potential $465 million deal could open a vast and rapidly growing market that might ultimately save the struggling Massachusetts firm. Demand for advanced batteries in China is projected to double by 2016 to $9.2 billion, and US companies that partner with Chinese firms will have key advantages.
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