Gold Cap supercapacitor discharges in seconds when fully charged

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ramonegumpert
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Dear Experts

I am using Gold Cap super capacitors. About 3.3 Farads ones at 2.5V.

When I charged it to 2.5V, it immediate starts to discharge within a few seconds even when not connected to load.

Is this normal?

Thank you for reading.

Best regards
Ramone
 

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How did you determine the discharge is occurring? What is the rate of discharge?