Fisker Automotive Inc., the struggling maker of $100,000 sports cars powered by lithium ion batteries, is in talks with A123 Systems' new owner on a revamped battery-supply deal while sparring with the portion of the battery maker's estate left behind in bankruptcy, Dow Jones Daily Bankruptcy Review reported today. The Southern California automaker, whose Karma sedan is powered by battery packs made exclusively by A123, has struggled since the battery maker's chapter 11 filing last fall. Wanxiang America, a subsidiary of China's Wanxiang Group, bought A123's automotive-battery business at a bankruptcy auction.