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This paper presents theoretical and experimental analyses used to evaluate the behavior of a capacitor-based hybrid source while supplying a pulsed current load. A PEM fuel cell and a variety of battery types were tested in the laboratory for their capability to supply a pulsed load. The capacitors used during testing were found to be effective in reducing the fuel cell/battery current. Experimental test results show that using low-ESR capacitors can reduce voltage deviations. Test results also show that a capacitor-based hybrid is a promising power source for supplying a pulsed current load.