My battery has lots of corrosion and is leaking. It was also manufactured in May 2009, so I'm guessing the used dealer put it in as a refurb or something last year. I'm wanting to upgrade to an AGM battery, but there appears to be a pandemic-related shortage. Costco says Interstate just informed them they had to cut production of AGM batteries a couple months ago. They say they don't know when they will get any in size 35. Advanced and AutoZone are both out of theirs. Napa actually has them, but they only have an 18-month warranty, vs the three years for those I already mentioned. Walmart shows none available. Pep Boys has the Champion available, with an impressive 48 month replacement warranty for $153+. So it looks like that's the winner by default.