http://www.leginfo.ca.gov/cgi-bin/displaycode?section=pen&group=00001-01000&file=240-248
California Penal Code Section 242/243(e):
242. A battery is any willful and unlawful use of force or violence upon the person of another.
243(e). (1) When a battery is committed against a spouse, a person with whom the defendant is cohabiting, a person who is the parent of the defendant's child, former spouse, fiancé, or fiancée, or a person with whom the defendant currently has, or has previously had, a dating or engagement relationship,
the battery is punishable by a fine not exceeding two thousand dollars ($2,000), or by imprisonment in a county jail for a period of not more than one year, or by both that fine and imprisonment. If probation is granted, or the execution or imposition of the sentence is suspended, it shall be a condition thereof that the defendant participate in, for no less than one year, and successfully complete, a batterer's treatment program, as described in Section 1203.097, or if none is available, another appropriate counseling program designated by the court.