KEMET FM Series Super Capacitors. KEMET FM series super capacitors are designed for high energy storage applications.supercapacitors can be used like a secondary battery when applied in a DC circuit. These supercapacitors are suited for use in low voltage DC hold-up applications such as embedded microprocessor systems with flash memory. Features. Rectangular case Wide range of temperature from 25°C to +70°C Maintenance free Highly reliable against liquid leakage Leads can be transverse mounted