How can you "plead to simple battery" but not have a conviction entered?? That doesn't make sense. The fact you were sentence to court supervision doesn't negate the conviction that gave them the right to impose a sentence, ie. supervision. Sounds to me like you have the conviction on record but the issue to hammer out is whether or not it is legally considered a "domestic battery punishable of up to one year in prison". It possible to squeek through the cracks and not have a conviction reported to the FBI but once its there you are out of luck.
Why has INTEGRITY become such a rare commodity?