Most of the batteries you will find on retail shelves are made by Johnson Controls so you aren't getting better batteries by going to one store over another. A few batteries are made by Odyssey and seem to have a better reputation. I maintain all the cars in the family fleet and the Johnson controls batteries work fine for me. Just replaced the battery in my dad's 330,000 mile Crown Vic, it was 7 years old with a 6 year warranty. Basically in my opinion since all the parts stores, Walmart, etc. sell the same batteries just buy the warranty you want at the best price you can find. FWIW my ZJ has a Autozone Duralast Gold (34DG IMS). It's the fourth tier (Econo, Valu, Dura, Dura Gold, Dura Platinum) 3 year/7 year warranty.