That is a first for me on this forum.
From the Batteries+ test, it was definitely severly depleted. But why ? Not from 20 minutes of radio.. Just a wild guess here : did you ask your wife if she did anything else other than listen to the radio ? Something that could've drawn power? Ignition on Run instead of Acc ?
My advice, for now, is get that X2 Power charged up to 100%, and take it from there...