S.C. Code Ann. § 39-49-20: Identifying batteries as "rental".

Any such person may mark any such battery belonging to him with the word "rental" or any other word of similar meaning, printed or stamped upon or attached to such battery, together with such words as shall identify such battery as the property of the person so marking it. It shall be unlawful for any person to so mark any such battery which is not the property of such person.