There's no reason Kareem Hunt shouldn't be arrested and charged with battery for attacking that woman back in February ... so says famed prosecutor Christopher Darden.
"I would have filed battery charges against him," Darden tells TMZ Sports ... saying the video evidence would essentially make it an "open-and-shut case."
Darden is most famous for his work in the O.J. Simpson trial, but also prosecuted tons of cases during his 15-year run as a part of the L.A. County District Attorney's office.