NEW YORK and EDISON, N.J., June 24, 2020 /PRNewswire/ – B. Riley Principal Merger Corp. II (NYSE: BMRG, BMRG WS, BMRG.U) (“BRPM II”), a special purpose acquisition company sponsored by an affiliate of B. Riley Financial, Inc. (NASDAQ: RILY) (“B. Riley Financial”), and privately held Eos Energy Storage LLC (“Eos”) today announced they have executed a letter of intent (“LOI”) for a business combination transaction (“transaction”) which would result in Eos becoming a publicly listed company.