And there should be a visible vent on top for regular electrolytic.
I have never seen it on top for SMD mount electrolytics, probably due to the reflow temperature rupture possibility they have designed it in the bottom of the casing where it stays cooler but that is just a guess from my side.
So SMD bottom stays cool so vent in bottom, and through hole the top stays cool so vent is in the top.
My guess indeed a normal SMD mount electrolytic 820uF / 3V from the KS series but I can't find the manufacturer. All A brand manufacturers the KS series is through hole.
You can replace it with a SMD or normal through hole electrolytic 820uF /6V3 or 10V or what you can get or have in stock and that will fit the mechanical space.
First measure the voltage that is on the pads, it should be < 3V otherwise come back here and report since then we have a mystery.