Same situation. 2022 Challenger Dark Horse was on a battery tender most of its life, recently went 2 weeks without plugging it in and the batterybwent completely flat. I also found out why the radiator shroud was kind of bulging, as the battery brace was missing that 6mm bolt (the 3rd one you removed)
@Iceagetv then I just opened my email, as of last week, 2022 Indians now have a recall because the power does not fully shut off making a larger draw to the battery than it should.