MIL-PRF-49471/11A(CR)
Initial voltage delay: During the I, H, HT, and IT discharge test, initial voltage below 4.00 volts
cannot exceed a 5.0 second duration. During the L and LT discharge tests, initial voltages below
3.80 volts cannot exceed a 60.0 second duration.
METHODS OF EXAMINATION AND TESTS:
Capacity test:
(1) Storage:
Details on storage conditions for all capacity tests are specified in the basic
specification.
(2) Discharge:
Cells (forced discharge): Two cells shall be discharged at 2.0 amperes at 70+5oF
to 2.0 volts. Each discharged cell shall then be connected in series to one fresh
cell. Each string shall be discharged at 2.0 amperes at 70+5oF for 3.2 hours.
Batteries: For all capacity tests, except the LR1, H and HT, the batteries shall be
discharged at 2.0 amperes constant current to cut-off volts (zero volts for the LR1
test). For the H and HT capacity tests the batteries shall be discharged through 2.0
amperes constant current for five minutes followed by open circuit for five
minutes. This cycle shall be repeated until the closed-circuit voltage reaches cut-
off volts. For the LR1, the batteries shall be discharged at 135 milliamperes to 4.5
volts, then at 1.1 watts to 1 volt.
Forced Discharge: After discharge to zero volts on the I capacity test, batteries
shall be forced discharged at 2.0 amperes for a minimum of 5 minutes.
Overload test: Batteries shall be discharged at 4.0 amperes.
Abuse test, predischarge: Designated samples shall be discharged at 2.0 amperes
for 1.6 hours.
Abuse test, pulse discharge: Batteries shall be discharged at 2.5 amperes for 1
minute followed by 1.8 amperes for 4 minutes, cycled continuously to cut-off
voltage.
Closed-circuit voltage test (battery and cell string): Load resistance of 2 ohms shall be used.
Voltage shall be above 4.00 volts within 10 seconds.
Cell closed circuit voltage test: Load resistance of 1 ohm shall be used. Voltage shall be above
2.0 volts within 5 seconds.
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