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

2.3 Performance.

2.3.1 Assembled battery.

2.3.1.1 Ampere-hour capacity. The battery shall have an ampere-hour capacity not less than that specified in table I.

2.3.1.2 Cranking ability. The battery shall deliver the specified current for not less than the period of time specified in table I. During the first 5 seconds of cracking, the terminal voltage shall drop no lower than the value specified in table I.

TABLE I. Electrical performance characteristics.

Battery type	2HNC	6TNC
Number of cells	10	10
Weight filled	40 lbs	80 lbs
Nominal voltage	12 volts	12 volts
Rated capacity	35	70
5-hour rate	amp-hr	amp-hr

Cranking ability:
Discharge rate	150 amps	300 amps
Minimum time at minus 40�F	5.5 minutes	5.5 minutes
Minimum time at plus 80�F	10.0 minutes	10.0 minutes
Minimum 5-second voltage at minus 40�F	8.0 volts	8.0 volts
Life cycle minimum capacity	250	300
Overcharge minimum capacity	9 cycles	14 cycles

2.3.1.3 Endurance. The battery shall complete not less than the number of cycles specified in table I. Complete discharging and shorting of the battery to balance the individual cell capabilities may be conducted when required by poor battery performance.

2.3.1.4 Overcharge cycle capacity. Overcharge cycle capacity shall be equal to 10 times the normal rated ampere-hour capacity of the battery as specified in table I. The open circuit phase shall be allowed for a maximum of 48 hours and the discharge phase rate shall be as specified in table I.

2.3.1.5 Retention of charge. Batteries shall show no more than 20 percent (%) decrease in rated five-hour capacity at the plus 80�F + 5�F temperature capacity discharge and shall show no more