Did you have your battery jumped before getting the new battery?Yep two months sitting untouched most cars with a lot of electronics will kill the battery.
Somehow FCA got sold batteries that were defective. My battery died in less than a year and I experienced the disconcerting "Christmas Tree " light episode. Terrible feeling. The battery was replaced and everything is ok now. Problem did not reappear.
If you experience anything like this. It's the battery.