A-A-52417 Battery, Storage: Alkaline, Nickel-CadmiumThis CID covers the requirements for nickel-cadmium storage batteries primarily for service in military vehicles, starting of missile ground power equipment, radio operation, and as a source of electrical energy for operating vehicular accessories control mechanisms. The nickel-cadmium batteries have a wide tolerance to temperature extremes. They require less derating at low temperatures than lead acid units. Since the specific gravity of the battery electrolyte does not change with the state of charge, they are not susceptible to freezing once a discharge is underway. Nickel-cadmium batteries can operate from plus 200 degrees Fahrenheit (degrees F) to minus 65 degrees F without damage or without the threat of freezing.

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A-A-52417A

than 80% decrease at the high rate as specified in table I at the minus 40°F temperature capacity discharge.

2.3.1.6 Temperature rise. The battery while fully charged, shall be placed in an ambient temperature of 120° + 5°F for a period of 24 hours. The battery shall then be discharged at the high rate specified in table I to a terminal voltage equivalent to an average of 0.6 volt per cell. Immediately following this discharge, the battery shall be placed across a potential of 15 volts and charged for a period of two hours and then discharged at the five-hour rate. The battery shall then satisfactorily meet 80 percent of the rated ampere-hour capacity as specified in table I.

2.3.2 Battery components.

2.3.2.1 Dielectric strength. The battery with all external surfaces and parts clean and dry shall be subjected to 2,500 volts root mean square (rms) at a frequency of 60 cycles per seconds (cps) between the current carrying parts and the container for 60 seconds. The container shall be free of leaks and other imperfections, and shall evidence no perforations or burning (see 2.4.1.4).

2.4 Physical.

2.4.1 Assembled battery.

2.4.1.1 Vibration resistance. The battery, while in a fully-charged state and at an ambient temperature of 80 + 10°F, shall be subjected to a vibration consisting of a simple harmonic motion having an amplitude of 0.03 inch (0.06 inch maximum total excursion). The frequency shall be varied uniformly between the approximate limits of 10 and 55 cps and return to 10 cps and shall be traversed in approximately one minute. The battery shall maintain a steady voltage and current with no loosening of any component parts of the connectors, flooding of electrolyte at the top, broken connections, straps, plates or other damages which would result in a reduction of required performance.

2.4.1.2 Vent plug leakage. The vent plugs shall not leak and shall open to permit discharge of gas before the internal pressure reaches a maximum of 0.5 pounds per square inch gauge (psig) in excess of the external pressure.

2.4.1.3 Terminal post torque resistance. The terminal posts shall withstand a torque of 250 pound-inches applied in the direction perpendicular to the axis of the terminal posts without causing distortion, leakage, or other damage to the battery.

2.4.1.4 Dielectric strength. The battery container shall be free of leaks and other imperfections, and shall evidence no perforation, burning through, or breakdown of insulation (see 2.3.2.1).

2.5 Environmental.

2.5.1 Assembled battery.