My battery was dead after being gone 7 days, how do I charge it?

What is your question?

If I call AAA to start, can I then plug it in to continue charging. Haven'y had problem since new battery year ago

What makes this problem better or worse?

it just happened, was gone 7 days, battery dead when returned

How long has your 2012 Chevrolet Volt had this problem?

found it when got home