The HBM-2R3-J307FRYJ2246 from Jinzhou Kaimei Power is a Supercapacitor with Capacitance 300000 mF, Voltage Rating 2.3 V, Equivalent Series Resistance 25.2 mOhms, Temperature Operating Range -25 to 60 Degree C. Tags: Surface Mount. More details for HBM-2R3-J307FRYJ2246 can be seen below.