MIL-PRF-49471/4A(CR)
capacity tests initial closed-circuit voltages below 2.00 volts cannot exceed a 10.0 second
duration.
Negative Terminal Insulation: The negative terminal shall be electrically insulated from a flat
surface placed against the side of the battery (the 0.749 inch dimension) even when the battery is
not parallel to the surface.
METHOD OF EXAMINATION AND TESTS:
Capacity tests:
(1) Storage: Details on storage conditions for all specified capacity tests are described in
basic specification.
(2) Discharge: Discharge current for all capacity tests shall be 50 milliamperes constant
current. All samples shall be discharged to cut-off voltage except for the I test; I test samples
shall be discharged to zero volts, then force discharged at 50 milliamperes for a minimum of 5
minutes.
Abuse test predischarge: Designated samples shall be discharged at 50 milliamperes for 9
hours.
Abuse test, pulse discharge: Batteries shall be discharged at 55 milliamperes for 1 minute
followed by 40 milliamperes for four minutes, cycled continuously to cut-off voltage.
(3) Cell Forced Discharge: Two cells shall be discharged at 50 milliamperes at 70+5°F to
2.0 volts. Each discharged cell shall then be connected in series with one fresh cell. Each string
shall be discharged at 50 milliamperes at 70+5°F for 18 hours.
Closed-circuit voltage (Batteries and cells): Load resistance of 20 ohms shall be used. Voltage
shall be above 2.0 volts within five seconds.
Negative Terminal Insulation: When a ten pound force is applied across the battery diameter, no
electrical contact shall be made even if the maximum angle between the battery surface and the
contact surface is 15°. The contact surface to be used in the test shall be a flat iron or steel plate
measuring 3/4" x 3/4". Its thickness shall be 1/8". These dimensions are all minimums.
The lack of electrical contact shall be demonstrated with a voltmeter set so that 3.00 volts is
readily evident. During the test, one terminal of the voltmeter shall be attached to the positive
terminal of the battery and the other terminal of the voltmeter attached to the reverse side of the
contact surface. Zero volts shall be read.
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