If this is a neon install, why are you running the power straight off of the battery? I hope you are planning on putting a switch on it. Why not run it off of the fuse for the lights? That way, the neon come on when you turn your lights on. You don't want your neon running 24/7. As for the ring terminals, you can get them with different size holes, in the same wire gauge size. Just gotta look for them. I still think a ring terminal on the battery for an 18ga wire is a bad idea. Lots of other ways to get power to an accessory using that size wire.