The U.S. Air Force is conducting market research to identify sources for a Commercial Off-The-Shelf Lithium-ion battery system and integration kit to replace the current Nickel-cadmium batteries on the MH-139A aircraft, aiming to improve cold-weather performance, reduce weight by approximately 50%, and eliminate maintenance requirements. The system must operate in extreme cold climates, allowing 10-minute starts from a -40°C cold soak, and include a complete integration kit with main and auxiliary batteries, mounting system, wire harness, and panel-mounted annunciator. Respondents must demonstrate the ability to obtain or already possess an FAA-approved Supplemental Type Certificate (STC) for the AW139/MH-139 platform. Responses are due by 5:00 PM Eastern Time on 10 July 2026, and should include a Rough Order of Magnitude cost estimate for hardware and non-recurring engineering, as well as an estimated timeline for STC approval and delivery. No budget amount is specified, and the location for performance of services is not mentioned.