High-voltage capacitor, electrolytic capacitor, axial electrolytic capacitor,

 EEE-FT Series 6.3 V 680 uF Ø6.3 x 7.7 mm 105° Low ESR Electrolytic Capacitor

https://www.futureelectronics.com/p/passives--capacitors--aluminum-electrolytic-capacitors/eee-ftj681xap-panasonic-8057989