Hi and thanks for using 2CarPros.com.
I agree with Wally. However, it could be coincidental that the battery just now decided to go bad, or as he mentioned, there is a parasitic draw. Here is a link that will help you determine if there is a draw and narrow down where it is coming from:
https://www.2carpros.com/articles/car-battery-dead-overnight
Additionally, here is a link which describes how to load test a battery to determine if it is good or bad:
https://www.2carpros.com/articles/car-battery-load-test
Let us know if this helps or if you have other questions.
Take care,
Joe
Monday, July 30th, 2018 AT 6:36 PM