Batman uses his sheer will to cause Kilowog's ring to leave it's owner and join with him instead. He then proceeds to solo the entire Justice League for kicks, and finally uses Kilowog as a toothpick.
Nah, I joke. Kilowog wins, even with prep. Unless Bats can get help from the Justice League in that prep time, nothing he has can hurt a Green Lantern (at least, I don't think so).