I replaced my 12v Battery last year, but I don’t drive it very often, and a few months after being replaced, I got a low-battery warning when I left the car sitting in the garage for two weeks while I was on a trip. After that, I always keep the battery tender connected when I am not using the car. Pat told me that the lifespan of these batteries is more like 3-4 years, and serious consequences ensue if it dies, up to and including, bricking the car.
Original owner of 2012 Eco Sport Black (Eclipse) with Monsoon Tritone Interior. VIN: -0641