This paper addresses recent activities relating to energy storage systems capable of delivering very high power. Specific power in the range of 2.0–2.2kW/kg and power density in the range of 5.0–6.5kW/l were obtained at current densities of 0.43–0.86A/cm2 (400–800A/ft2). The designs incorporate the use of thin, plastic bound electrodes laminated to nickel foil substrates. The units tested were nominal 28V, 24Ah batteries, as well as individual cells.