When charging and discharging the capacitors it is best practice to never discharge them below 0.0 volts. Typically a safety factor would be used here, for example only discharging them down to no less than 0.1 volts.

When discharging a capacitor with a constant current discharge the change in voltage will be linear.

I = C dv/dt

I = Current

C = Rated Capacitance

dv = change in voltage

dt = change in time

Below are two graphs showing a typical charge discharge cycles (down to 0.01 Volts) with the potential (V) and Current (A) graphed.

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