I had a bad battery in my Hellcat that was 2 months old, so age is arbitrary when discussing batteries.
As @watersupply189 said, you should have a warranty on the battery so you should be able to get it swapped out easily.
Side note, I live in Arizona...batteries here last half the stated life due to climate (AutoZone's warranty program is beast for this)....I see you're in MA...you have an extreme climate as well so if you got 2.5 years out of a 5 year battery, you're tracking right on target for conditions.
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