A123 Falls Most in Two Years on Concern Fisker Sales to Drop

A123 Systems Inc., a U.S. maker of batteries for electric cars, fell the most in more than two years after its largest customer stopped work on a factory and an analyst downgraded its shares.

A123, based in Waltham, Massachusetts, fell 24 percent to $1.88 at the close in New York, the biggest decline since September 2009.

Fisker Automotive Inc. said Feb. 6 that it fired 26 employees and stopped work at the factory it’s developing in Wilmington, Delaware, to make plug-in electric vehicles after the U.S. Energy Department blocked access to a federal loan.

The funding may never be restored “because it has become part of an intense political debate,” Theodore O’Neill, an analyst at Wunderlich Securities Inc. in St. Louis, wrote in a research note today.

Fisker is A123’s largest customer, he said, and “may not be able to afford any more batteries.” O’Neill cut his recommendation on A123 to “sell” from “hold” and his price target to 50 cents from $3 a share.