The XL60-2R7308W-R from Eaton is a Supercapacitor with Capacitance 3000000 mF, Voltage Rating 2.7 V, Equivalent Series Resistance 230 mOhms, Temperature Operating Range -40 to 65 Degree C. Tags: Through Hole. More details for XL60-2R7308W-R can be seen below.