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The feasibility and practicability of operating an ion-exchange fuel cell in a zero-gravity environment for a short period was successfully demonstrated by re-entry vehicle flight 423. In a 25-minute flight, the zero-g environment had no effect on the electrical performance of the fuel-cell design flown. The battery delivered 150 milliamperes at 6.0 volts, which was almost the predicted output. Test results indicate that, within certain limitations, the sealing of a silver oxide - zinc cell is feasible. For certain missile applications, namely where low or medium discharge rate and a limited (5 cycles maximum) cycle life is required, a sealed silver oxide - zinc battery could be developed to reliably meet the requirements. (Author)