I've got a fairly large capacitor (hundred mF's) that has a low voltage rating (10V). And, when I charge it to that value, as soon as I remove power supply (same voltage) the capacitor drops to around 6V (60%).
Is this possibly a capacitor electrolyte leak? I've subjected the capacitor to fairly harsh conditions.
EDIT: I forgot to mention, when I reconnect the power supply, the 6V suddenly jumps back to 10V, and when I disconnect, again, down to 6V... Perhaps, the capacitor never actually reaches 10V?? But it's weird as I observed the charging from nearly 0V to 10V, in a logarithmic way (or is it right shifted upside down exponentiation??).