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I prefer Interstate brand batteries, however, suggest to look for the longer warranties. Chances are if the store is willing to stand behind it for several years, it's probably a pretty good battery. Going into the 5th year on an AutoZone Gold 8year warranty battery - so far, so good.
Suggest this is a good time to clean the terminals up clean-clean for a good connection. I like to put a light coat of Vaseline on the terminals to prevent future corrosion.