Apple has poached five key engineers from A123 Systems to work in a new battery division at the Cupertino technology company, with some hires possibly going as far back as June, a new report claims. The battery maker claims that these hires violated agreements it had in place to prevent them from joining competing companies.

The employees the report refers to are Don Dafoe, Michael Erickson, Indrajeet Thorat, Mujeeb Ijaz, and Depeng Wang. Three of these workers—Erickson, Thorat, and Wang—were PhD project heads working on new battery technology. Ijaz headed up the System Venture Technologies Division, which oversaw work by all four of the others.

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