dodge guy wrote:
That type of buildup is from a leaking battery. There is a small crack around the battery post that is allowing the gasses to escape and the resulting crud buildup. Tell them the battery is leaking. They have a failure code for that and can replace a leaking battery even though the battery may test good. And tell them to replace both so the system functions properly.
I actually replaced my wifes Motorcraft battery this morning. I took it to the Ford parts dept. and that's when I noticed the plastic delaminated from the negative terminal. I did receive a free replacement.