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The Boston Globe

Business

Japan’s NEC to buy unit of Waltham battery maker A123

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 Westborough and makes large battery systems, known as grid scale, that might be used by utilities to store power from intermittent sources such as wind turbines. The acquisition, from the American subsidiary of the Chinese auto parts conglomerate Wanxiang Group — which bought A123 out of bankruptcy in late 2012 — is expected to close in June.

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