I’d think any cap that you bought off the shelf would have been in a discharged state for a long period, however if kept in circuit with a battery (and if both are coupled on the same side of the key switch) The cap would be kept charged for a reasonable length of time until the battery was drained or the fuse removed from the cap (granted I don’t know how long the cap would hold a charge for in a disconnected state???

Thinking that caps and ignition condensers are much the same thing, I’ve had ignition condensers with the 1970 stamping on them work better than brand new condensers

Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)