Evaluation of UltraBattery™ performance in comparison with a battery-supercapacitor parallel network

► Comparative electrical performance of an ultra battery and a lead-acid battery is examined. ► A model is developed for the ultra battery which is verified experimentally. ► Comparisons are made to conventional lead-acid battery/supercapacitor parallel networks. ► Parallel network tests highlight the respective roles of the supercapacitor and battery. ► The work informs application of the ultra battery to transient charge/discharge applications.