This Panasonic 1000uF Ultra Low ESR 25V electrolytic capacitor is ideally suited to 4S voltages, used as a main filtering capacitor where power enters your quad (PDB or 4in1).
This Panasonic 1000uF Ultra Low ESR 35V electrolytic capacitor is ideally suited to 6S voltages, used as a main filtering capacitor where power enters your quad (PDB or 4in1).