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NEC to buy unit of Waltham battery maker A123

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The Chinese owner of A123 Systems LLC on Monday sold a large Massachusetts division of the battery maker to Japan’s NEC Corp. for about $100 million.

The Japanese technology company will buy A123 Energy Solutions, which is based in Westboroughand makes large battery systems, known as scale, that might be used by utilities to store power from intermittent sources such as wind turbines. The acquisition, from the American subsidiary of Chinese autoparts conglomerate Wanxiang Group — which bought A123 out of bankruptcy in late 2012 — is expected to close in June.

In a statement, NEC said the purchase will add to its technology and help make the Japanese company one of the world’s largest makers of grid-scale batteries.

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