11 Feb 2015 How do I read the warranty date code on my battery? The warranty date was made in September 2014. Page 2. Date: 2-11-15 Revised. Page 2. ACDelco PROFESSIONAL Series (5YR, 6YR, 7YR). Battery . If the battery fails to hold a charge due to a defect in materials or workmanship in the first (3) three.