First, what is this car? I saw it outside of my high school, and I'm not too familiar with classic muscle cars. EDIT: It's a Pontiac LeMans.
Anyways, as per some of your suggestions, I have slightly modified my Nissan Leaf "Low Battery" design. It used to look like the first image:
It now looks like the second one.
What do you think of the edits? Also, what color should the charging station, arrow, and numbers be?