If we select a 10 Farad, 0.06 Ohm part it can be seen that at –10 °C operation and end of life the voltage drop is larger than the required 0.5 Volts, however instead of simply selecting the next higher value of capacitor if we use smaller capacitors connected in parallel we can achieve a lower cost solution. By taking two of the 6.8 Farad, 0.1 Ohm parts that we originally selected and connecting them in parallel we get a 13.6 Farad, 0.05 Ohm device that meets our requirement. This clearly shows the combined effect of aging and operation at sub-zero temperatures as our final solution requires twice the capacitance and half the ESR of our initial basic selection.