Exhibit 31.3

I, Michael E. Manna, certify that:

1. I have reviewed this Amendment No. 1 to annual report on Form 10-K of Ultralife Corporation; and

2. Based on my knowledge, this report 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 report.

Date: April 28, 2025	By:	/s/ Michael E. Manna
		Michael E. Manna
		President and Chief Executive Officer