I bought Advance Auto Parts top "platinum" battery last December, and now less than a year later it won't hold a charge and we've had to get a jump start twice. The mechanic tried to charge it for hours and says it has a bad cell. The local Advance Auto Parts store refuses to honor the three-year warranty and replace the battery. I even showed them the photo from the mechanic's battery tester that says "REPLACE BATTERY", but they won't listen to reason or honor the warranty.