The Army Research Laboratory requires one isothermal calorimeter with four-channel electrochemical control for simultaneous battery testing, to be delivered to Adelphi, MD. This is a notice of intent to sole source to TA Instruments-Waters L.L.C., as they are the only known provider ensuring experimental continuity with existing equipment. The anticipated award date is August 14, 2026. No budget amount is specified. Performance will occur at ARL facilities in Adelphi, Maryland.