MIL-PRF-32273, PERFORMANCE SPECIFICATION: BATTERY CELLS AND MODULES, VALVE REGULATED LEAD-ACID, MAIN STORAGE, SUBMARINE; GENERAL SPECIFICATION FOR (31 OCT 2007)., This specification covers valve regulated lead-acid (VRLA) main storage battery cells (see 6.5.1), modules (see 6.5.3) and installation and checkout parts (see 6.8) for submarines.