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If you get the 3 stage "smart charger", just hook it up and don't worry about it! It will know by the charging curve.
I'm due to buy a couple of batteries this spring, but I just have a hard time justifying 200+ for each blue top battery. My Wal-Mart Everstart Maxx have lasted 3-4 years and I 've been very pleased with them. Gotta make a decision soon.....
You might look at the Cabela's AGM batteries. They are pricey, but I think they are cheaper than the Optimas.