Why won't my battery stay charged? At 173k Replaced alt still dies every week?

What is your question?

01 s40 173k Had battery tested and fully charged at autozone Then figured it was that alternator Had that and the serp belt replaced. Ran fine for a week then I had the door open for maybe 10 mins (car off light on) and then it wouldn't start. Jumped it and took a drive for 30 mins to see if it would charge up, and wouldn't start again. Thinking there's a power drain from a light or something any clues on common issues or where to start looking?