What does the Sonata SE battery discharge warning mean?

Hey all,
I have a 2019 Sonata SE. This morning, I drove 40 miles, then parked my car. Ten minutes later, I put it in the garage, and when I turned it off, I got this warning. I have 7000 miles on my car and never received this warning before. I don’t have a smart key. What does this warning mean, and why did it happen? Thank you.

Hey Alex, the battery discharge warning means that you should turn off any accessories that are draining your battery.
It also indicates that your alternator might be faulty

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Hello, Have the battery and the vehicle’s charging system tested by a professional. Many auto parts stores offer free battery testing services.