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Electro Energy Inc.'s (EEI's) patented bipolar nickel-metal hydride battery design, based on flat wafer cells, has resulted in high power and energy densities. This design approach leads to increased capacity at a reduced weight and volume, when compared to other rechargeable batteries and energy storage devices. These advantages make the bipolar NiMH a logical choice for Army Silent Watch applications, where it is essential to maximize energy and minimize weight and volume. Through programs with Army Cecom EEI has successfully built a high energy battery system that would replace existing lead acid batteries and provide silent watch operation for an extended period of time. In addition, the bipolar Silent Watch battery offers reduced volume and weight over fuel cells considered for this application. EEI's internal safety/control system allows the battery to serve as a drop-in replacement for many applications requiring silent watch operation.