Will the battery drain if doors & trunk are left open for 4-5 days in a 97 E420? I noticed that all the interior lights go out after a few minutes, and also the trunk light can be deactivated by pulling the gray knob. So is battery power still getting consumed at this point.

I'm asking b/c i left the doors open, made sure all the lights were out, and then when i came back after 4 days the battery is completely dead, no lights, no crank, nothing.

thanks for help