In Georgia, the statute defining simple battery is:
§ 16-5-23. Simple battery (a) A person commits the offense of simple battery when he or she either: (1) Intentionally makes physical contact of an insulting or provoking nature with the person of another; or (2) Intentionally causes physical harm to another. (b) Except as otherwise provided in subsections (c) through (i) of this Code section, a person convicted of the offense of simple battery shall be punished as for a misdemeanor.
I did not copy and paste the entire statute here. The rather lengthy sections c through i of that portion of the code go on to describe many aggravating circumstances (victim age 65 or older, pregnant victim, etc.) which elevate the offense to a more serious crime. Therefore, one can be charged with "simple battery" and get a variety of different punishments, depending on the victim.
If the victim is not in one of the many protected classes of individuals which would elevate the seriousness of the crime, then the sentence is controlled by § 17-10-3. That statute is too long to include in this answer, but the gist of it is that a variety of sentences may be imposed, including a fine of up to $1,000, imprisonment of up to one year in a county jail, weekend confinement (allowing the person to work during the week), or probation. Additionally, the court may suspend a sentence, which means that if the person violates any terms of the court order, the sentence (usually jail in those circumstances) may be imposed.
Generally speaking, unless the crime was particularly bad, a first offender will not be looking at the more severe end of the sentencing spectrum. Generally, one would be looking at fines, probation, etc., rather than a year in jail. Also, if there were any medical bills (VERY rare in a simple battery misdemeanor charge), an order of restitution (paying the victim back) would be expected.
Aggravated misdemeanors (where the victim was in one of those protected classes) are covered by § 17-10-4. In those circumstances, the maximum fine is $5,000. The maximum term of imprisonment is still 1 year. Earning good time credit on the sentence in such circumstances is limited to 4 days per month of sentence.
Good luck and best wishes!