CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Joseph Mastrangelo, certify that:

1.I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K (the “Amendment”) of Eos Energy Enterprises, Inc.; and

2.Based on my knowledge, this Amendment does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this Amendment.

Date	March 7, 2024	/s/ Joseph Mastrangelo
		Joseph Mastrangelo
		Chief Executive Officer
		(Principal Executive Officer)