I bought a new battery from autozone too, and had nothing but problems with it. Took it back and got a store credit for it, and spent the extra money for a Sears maintenance-free kind. I highly recommend it. It works like a charm, and the filling procedure is so much easier (the electrolyte comes in a plastic container separated into six compartments, so all you gotta do is mount it on the battery, and push on it to puncture the seals... No mess, and no need to try to check the level...)
Scout