Exide Technologies Inc., the car and machine battery maker, is preparing for a potential bankruptcy-protection filing by this summer, Dow Jones Daily Bankruptcy Review reported today. The Milton, Ga.-based company, which faces a September debt payment, will likely seek chapter 11 protection for the second time in a decade. The company, which makes and recycles lead-acid batteries for vehicles and other machines, has suffered amid declining profitability due in part, it has said, to steep restructuring expenses, weaker-than-expected demand in some markets and higher lead input costs.