Had an issue with my 2015 touring where it was slow cranking for the past 3 weeks or so, and yesterday it just clicked... Called the dealer after jumping it and getting home, was told that starting with the 2015 model, Mazda is warranting the battery in the CX-5 for the full 3/36 warranty period. I took it in today, they tested it, and replaced it free of charge... it cost me an hour of my time because I chose to wait.... Hats off to Mazda and the dealership on this one...
Bad battery, confirmed by Autozone tester. Got a new battery from Costco, for $78 after core($15). 640CCA/48 months warranty/Interstate.
You need that, if you store your car.