MIL-PRF-49471/1A(CR)
METHODS OF EXAMINATION AND TESTS:
Capacity tests:
(1) Storage:
Details on storage conditions for all capacity tests are specified in the basic
specification.
(2) Discharge:
o
Cells (forced discharge): Two cells shall be discharged at 2.0 amperes at 70+5 F
to 2.0 volts Each discharged cell shall then be connected in series to two fresh
o
cells. Each string shall be force discharged at 2.0 amperes at 70+5 F 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 I
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 test, batteries shall be discharged at 135 milliamperes to
6.5 volts, then at 1.7 watts to 1.0 volt.
Forced discharge: After discharge to zero volts on the I capacity test, the batteries
shall be force 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 & cell string tests): Load resistance of 3 ohms shall be used.
Voltage shall be above 6.00 volts within 10.0 seconds.
Cell closed-circuit voltage test: Load resistance of 1 ohm shall be used. Voltage shall be above
2.0 volts in 5 seconds.
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