PRESSURE EQUALIZING TUBE AND WIRE EXIT 



FILLING PLUG 



ELECTROLYTE 



BATTERY PLATES 



<£ 



Figure 1. Schematic cross-section of battery and test case, 



Because the size of the pressure test facility was limited 

 (6 inches in diameter), smaller batteries were used during 

 the test program than were actually used operationally. 

 Since the general characteristics of lead-acid batteries are 

 similar, it was not felt that this substitution imposed any 

 serious limitations on the tests. Three identical Willard, 

 2-volt, 20 ampere-hour, lead-acid cells were used. These 

 cells were labeled "A," "B, " and "C, " and will be so referred 

 to in this report. 



