The shell of A123 Systems Inc. left behind in bankruptcy is seeking to preserve millions of dollars in tax-credits with the state of Michigan, Dow Jones Daily Bankruptcy Review reported today. The lithium ion battery maker, which was awarded nearly $250 million in grants from the Department of Energy before filing for bankruptcy, received about $125 million in tax credits from Michigan to help offset the costs associated with construction of the company's battery-making plant in the state and as an incentive to hire local residents.