inside walls are flame-sprayed with zirconium oxide. The electrode terminal seal is of a Teflon compression type. Two types of stack orders are used: one in which the positive electrodes are placed back to back (called back-to-back) with the separator, then negative, with the gas screen following; and another, where positive electrodes are followed by the separator, then the negative electrode, then the gas screen (called recirculating). This sequence is repeated throughout the stack. A comparison of the two designs is given in Fig. 1 and Table I. Other cell/battery designs have emerged recently such as the bipolar [9, 10] and the common pressure vessel design [11], but the only flight experience or commitment for flight to date has been with the COMSAT or Hughes/USAF design.
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