I say re-wrap it. In all likelihood, it's fine for now but if you get it caught in there again, it's gonna tear more. I have a few mods that are a really tight fit for batteries (Sigeleis are famous for that), and once you get one little nick in them, it's downhill from there. And it seems the wraps that come on them are terribly thin anyway. For peace of mind, I'd just give it a quick re-wrap.