Acid may leak from the battery at the cable connections, resulting in corrosion on the battery cable ends and in the battery tray. A Leaking battery should be replaced and the cables thoroughly cleaned or replaced if necessary.
Car Problem Reports
Chevrolet Impala Corrosion on Battery Cable Ends
Chevrolet Impala Problem
Average Mileage: 75,000 mi (30,000 mi - 120,000 mi)
Visitor, 2011 Chevrolet Impala, 30,000 mi
This has been going on since I bought the car and I purchase it new. I've been replacing the cable ends over and over and even the battery twice and the problem still exist.