Don't know if it would matter either, but I always check my battery at the end of the summer. If it is not sealed, I pry the covers off, and add " battery water". You could use distilled water, but they sell the battery water which claims to be better? It's cheap enough to buy. I also clean the terminals with PB Blaster and a stiff brush. I the smear a small glob of Vaseline over each terminal. I was a little late doing it this season, and noticed a little hesitation in the time to crank over on the first real cold morning I encountered. It did take several ounces of water. I also noticed a significant improvement after I did this. And this is an Interstate battery that is not near expiration. But as billybob so clearly says, they can forecast battery failure better than weather can be predicted. Heat and cold are the natural enemies of a battery. You are almost better off replacing it at the expiration date. But, an ounce of prevention (no pun) doesn't hurt. I'm not sure if replacing with an Optima type sealed cell, makes sense. They are quite a bit more expensive. Don't know if it's overkill.
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