The RSHT1821M1JFH0002X from Taiyo Yuden is a Supercapacitor with Capacitance 820 µF, Voltage Rating 6.3 V, Equivalent Series Resistance 18 milli-ohm, Temperature Operating Range -55 to 105 Degree C. Tags: Surface Mount. More details for RSHT1821M1JFH0002X can be seen below.