A123 Systems (AONE -6.3%) is now off sharply on account of its Q4 warning, uncertain 2012...

|About: A123 Systems, Inc. (AONEQ)|By:, SA News Editor

A123 Systems (AONE -6.3%) is now off sharply on account of its Q4 warning, uncertain 2012 guidance, and delayed 10-K filing. Likely playing a role is a downgrade to Underperform from BofA: the firm sees short-term risk rising due to cost overruns, cash burn, and a lack of visibility and transparency. It's also worried A123's electric car battery may develop slowly, and face intense competition.