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AC Delco has a 3 year unlimited warranty with full replacement, I install alot of their maintenance free batteries in boats, however they are slightly on the higher side of price but have a good product. Haven't had to replace mine yet but will with AC's next year.
I have been an Interstate battery user myself for years. From what I understand the quality level of Interstate has dropped in the last few years, I have never had a problem with the product. Today I had a visit with my dealer for unrelated service and had 2 new Motor-Craft batteries installed, BXT65-850 for $190.00
You must understand one thing about alternators and batteries, the alternator does not charge a battery, only maintains a good battery. Once a battery starts to fail, your alternator is over worked and can fail also. Keep the batteries fresh and you will enjoy a trouble free vehicle.