A123 Systems (AONE -12.2%) is off sharply after Wunderlich, which upgraded the company in...

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

A123 Systems (AONE -12.2%) is off sharply after Wunderlich, which upgraded the company in October and defended it 2 weeks ago, downgrades it back to Sell on account of customer Fisker Automotive's most recent woes. Wunderlich believes Fisker will slash its production forecast for its Karma electric car even further, thereby hurting A123's battery sales.