Painted battery? I've been around Fords since the late 1970's, even worked in college in a auto parts house. I've never heard of a factory "painted" battery. Or any "painted" battery. Not to say someone didn't decide to color match his battery to his car and did so with a Rattle Can!
Lettering on top and maybe on the sides. Bill Upton's battery which I posted a pic link is RED painted on the top and silver on the sides. My friend's original B9 Battery he just bought had the red on the top. Since the batteries are molded in black paint would be used to letter. A google search looking for Tbred blue 69 Mach1 will show this. I tried uploading a 76K pic but the file uploader is full. Gary