AnnivSL320

Just 2 hours after coming home from church today, our 2014 E350 coupe will not start. No power accessories work and the only thing on the dash is that the park light and head light indicators will flash for a few minutes. I've tried with the key inserted and the push button and have the same results. No clicking, nothing. Just purchased this car a few months ago and I'm not sure, but think it has the original battery. So, I'm assuming it is just a bad battery. Any one think it might be something different?