my 2015 started acting like it had a failing battery last year. Dealer checked it about 7 or 8 times 10 minutes apart, and it was fine. The test equipment today is capable of even determining if the plates are failing. A week later it did the weird thing again so I took it straight to the dealer again. The first test revealed one cell was failed so Acura replaced it for free. The behavior and test would imply a strap between cells was loose or cracked. - sometimes when it made a good connection the battery was fine and other times it was not. FWIW we also had another brand battery made about the same time in another car fail the same way when it was only 6 months old - and it was made in 2017. I suspect based on threads here, my own experiences and another forum that one of the battery manufacturing firms had trouble in 2017 with some of their batteries. I wouldn't hold it against Costco if that is whom you buy batteries from. There are only four or five companies in the world that make auto batteries whether in their name or they put another label on them.