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A hybrid energy storage system (10) including a first energy storage device (12), such as a secondary or rechargeable battery, and a second energy storage device (14), such as an electrochemical capacitor. The electrochemical capacitor provides intermittent energy bursts to satisfy the power require

A hybrid energy storage system (10) including a first energy storage device (12), such as a secondary or rechargeable battery, and a second energy storage device (14), such as an electrochemical capacitor. The electrochemical capacitor provides intermittent energy bursts to satisfy the power requires of, for example, pulsed power communication devices. The first and second energy storage devices are coupled to a current controller to assure that pulse transients are not applied to the battery cell as a result of charging the capacitor.

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[ What is claimed is:] [6.] An energy storage device having an output for providing an electrical charge, including regularly spaced current pulses to an electronic device, said device comprising:at least one battery cell connected to said output;at least one capacitor connected across said output f

[ What is claimed is:] [6.] An energy storage device having an output for providing an electrical charge, including regularly spaced current pulses to an electronic device, said device comprising:at least one battery cell connected to said output;at least one capacitor connected across said output for providing said current pulses; andelectronic circuitry disposed between said battery and said capacitor comprising a first switch disposed between said battery and said output, a second switch disposed between said capacitor, and said output, and a controller electrically coupled to each said switch, and responsive to said current pulses.