The DDXE2R5LGN401KB65S from Nippon Chemi Con is a Supercapacitor with Capacitance 400000 mF, Voltage Rating 2.5 V, Equivalent Series Resistance 2.1 to 2.5 mOhms, Temperature Operating Range -40 to 70 Degree C. Tags: Screw Mount. More details for DDXE2R5LGN401KB65S can be seen below.