Battery maker A123 Systems, a one-time darling of the U.S. electric car industry and recipient of millions in government funding, filed for Chapter 11 bankruptcy Tuesday. A123 (AONE) missed an Oct. 15 interest payment totaling about $2.7 million on $144 million of debt. The battery manufacturer had $460 million in total assets and $376 million in debt as of Aug. 31, according to documents filed in U.S. Bankruptcy Court in Wilmington, Del. Tuesday.