AutoZone Auto Parts

issue with Auto Zone battery. Twice they charged it and told me my nearly new battery tested good, only for me to find it dead the next mornings. I took my car to the dealer thinking I had an electrical drain and paid for an expensive diagnostic. They said the battery was bad - won't hold a charge. The dealer could have convinced me to have an unnecessary repair or buy a battery from them but didn't. They said go back to Auto Zone, try to get a refund and buy a new battery somewhere else. The dealer said they see a lot of this with Auto Zone claiming their batteries are good and won't honor the warranty. I am going in circles trying to get this resolved. The Auto Zone manager says he can't replace it because it tests OK there. Their "warranty" is meaningless so Buyer Beware.