I wonder if you have problems with your alternator? I've never had a lead/acid battery last more than maybe 5 or 6 years. I think the heat down here kills them.
Full disclosure, I initially tried to order this battery from Rural King badged with their name. I did not get a confirmation or anything for a few days and I called and they said "Oh, we don't have any in the warehouse, so we were going to cancel your order." Well, I'm sitting here expecting it to show up and wasted about 3 days. I don't think they'd have called me or emailed me at all....They said it only showed inventory in some stores, and they had the best price of about $127 IIRC.