See this thread: Rav4 2020 LE Battery drained out for no reasonHi guys! i have a 2020 toyota rav4 le i got the same issue to everyone else that my battery got dead by parking it overnight. today my car wont start i have this problem ever since july but it happen today which happen to me twice between that july-sept. does anyone know what really costing the draining the battery of rav4? because what read all the comment was turnoff the parking brake and update the DCM firmware? anyone have idea?