The capacitors won't hold a charge indefinitely; as time goes on, charge slowly migrates from the positive to the negative plate. We can model this as a discharge of the capacitor via an internal "leakage resistance”. A 0.34F capacitor charged to 3.3V will initially discharge with the leakage current of 0.40mA
Determine how long will it take for the capacitor voltage to drop to 1.0?