A Chinese company’s preliminary agreement to invest in A123 Systems has ignited concerns that China could take control of the struggling Waltham battery maker’s advanced technology, and spurred new criticisms by Republicans that the Obama administration squandered billions in stimulus money with investments in risky firms. A123, which has warned investors that it is running out of cash, won a $249.1 million federal matching grant as part of the administration’s efforts to revive the economy and boost the nation’s clean energy sector
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