'20 MBP battery drain when powered off

I have a new MBP 13 (16gb, 2ghz core i5), Catalina 10.15.6 and I've noticed that there is battery drain after a few days even when I do a full "shutdown." As an example, it was showing 100% battery when I did my last shutdown. Tonight, after ~6 days of non-use, it shows 63% remaining once it booted up.

I've checked my energy preference settings and I can confirm that I did a shutdown and not a sleep.

What am I missing?

Thanks in advance!