Do you have a Costco in your area? After experiencing their return policy first-hand, I won't buy anywhere else. They don't advertise the details, but I got a full refund of the current new price, on a battery that was 4 years old. Walked out with a new one and it only cost me $5 (the core charge had gone up). The contrast to O'Reillys was extreme. (I had to yell at the manager to even get them to admit that a 72 month battery was still under warranty when it was 3 years old. And the replacement, that cost me as much as the 72 month battery even with their "adjustment", was only warranted for 24 months.)
Sorry, I don't recall the details; but I'm using a smaller battery that was less expensive. With the alternator, it works great for me.