Unless they are charged they are no different from any other component.
Capacitors can keep their charge for a long time, especially big ones. But you can discharge them by trying to run the device when it’s not plugged in or waiting a few minutes/hours/days.
Capacitors can keep their charge for a long time, especially big ones. But you can discharge them by trying to run the device when it’s not plugged in or waiting a few minutes/hours/days.