i got the same year and problem in the last year replaced battery 3 times.dealers are cluless but love to bill you service calls.i find that if you start car every day in the winter dont let it sit for more than 3 days.i bought a battery jumper the size of a ciggarette package off amazon for 40 bucks lift front hood attach to car ground and red cap battery post and juice it it starts easily another thing shut all radio heated seats and heat and air fans off.some module is staying on and drains the 12 volt normal battery.Update (in case it helps someone else someday): I was thinking about my new battery charger. I figured it probably tested the battery and when it failed to recognize the battery it ceased putting out any juice. So I connected jumper cables from my '95 pickup and voila, everything came to life.
So I immediately started the car, disconnected the jumpers and backed the car into the spare parking spot.
After shutting it off, I restarted it out of curiosity. That worked like normal. I did not drive it to work from fear of a recurrence.
The good news is that it is likely a 12V issue and not a high voltage issue or a computer issue.