Campbell led the Terps with 10.5 sacks per game in 2020.
Penn announced he would play at LSU.
Among other signings, coach Mike Locksley secured five-star wideout Rakim Jarrett.
Battle becomes the Terps' second decommit in the 2020 recruiting class.
Battle's commit comes just one day after the Terps landed offensive tackle Santana Saunders.