I'v not heard of any batt's with plastic wrap on them other than when their shipped to you, if that's what you mean, do take it off, my batt's all have a painted coating on them, some people sand them down with sand paper if they want to change the color etc, it does'nt hurt the batt you just have a chrome looking batt and their fine to use.
If your's has some kind of plastic coating on it and there's no metal under it, I think your in trouble, if there is metal, you might just want to wipe it down with so Goo to take the stickyness off and it should be fine. No question is dumb, that's how we learn. Good luck.