The M0820-2R5205-R from Eaton is a Supercapacitor with Capacitance 2000 mF, Voltage Rating 2.5 to 3.0 V, Equivalent Series Resistance 75 to 100 mOhms, Temperature Operating Range -40 to 60 Degree C. Tags: Through Hole. More details for M0820-2R5205-R can be seen below.