theseeleys welcome. It's too bad you got a "lemon." Do you have an SE or an SEL? If SE does it have MFT? I've not had a battery issue. But my take on Ford buyback is that early on Ford appeared to be more receptive to a buyback. It seems (although one never knows the whole story), that more recently Ford has taken a harder stance. You may have to go to arbitration (don't know SC law). It might not hurt to talk to a couple of "reputable" attorneys and get their take on the SC law and your chances of success since you are apparently beyond 12 k miles.
Also, very recently one member apparently had the battery fuse assembly (150 A fuse) which is part of the cable assembly attached to the + terminal of the battery develop high resistance and apparently wouldn't allow for proper charging of the 12 V battery (too much voltage drop across the fuse) which could perhaps explain why some people are having dead batteries over and over again. Ford replaced his DC/DC converter on the basis it had failed. But I'm wondering whether the converter really failed as with a new converter the dealer could only get around 13.5 V instead of around 14.4 V. 13.5 V is not sufficient to properly charge the battery. So, you might want to have the dealer look into this as a possible cause of your battery problems. Unless Ford has issued a TB on the fuse assembly, I seriously doubt most dealers would check this.
Keep us informed as that may help others with the dead battery issue.