Battery is generally a harmful or offensive contact with another person, without the person’s consent. Battery may be the basis for a criminal charge or offense. The definition and penalties for battery vary from state to state, and are usually located in a state's penal or criminal code (statutes). In some states the crimes of assault and battery are merged into one criminal offense.

Battery is also recognized in tort law as an intentional tort, and may result in civil liability (money damages) in a lawsuit against a person who commits battery.

In Wisconsin, battery is defined as intentionally causing bodily harm to another person without their consent. It is classified under the state's criminal code, specifically in Chapter 940 of the Wisconsin Statutes. The severity of the charge can range from a misdemeanor to a felony, depending on factors such as the degree of harm, the use of a dangerous weapon, and the victim's status (e.g., if the victim is a public officer or a family member). For instance, simple battery is typically charged as a misdemeanor, while substantial or aggravated battery may be charged as a felony. Additionally, Wisconsin law does recognize the merger of assault and battery into one offense in some cases, often charging individuals with battery for both the threat of harm and the actual harm inflicted. Beyond criminal charges, a person who commits battery may also face civil liability in a tort lawsuit, where the victim can seek monetary damages for the injuries and harm suffered due to the intentional act.