MIL-PRF-49471/8A(CR)
Capacity tests: When the battery is tested in accordance with the methods of examination and
tests of this specification, the minimum capacity test requirements shall be as specified below:
Capacity Test
Minimum Capacity Requirement
in Hours to 6.00 Volts
I
3.2
L
1.8
H
5.6
HT
5.4
LT
1.6
IT
2.7
LR1
47.0
Initial voltage delay: During the I, H, HT, and IT discharge tests, initial voltages below 5.70
volts cannot exceed a 5.0 second duration. During the L and LT discharge tests initial voltages
below 5.70 volts cannot exceed a 60.0 second duration.
METHODS OF EXAMINATION AND TESTS:
Capacity tests:
(1) Storage:
Details on storage conditions for all capacity tests are specified in 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
cells. 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 I
test). For the H and HT capacity tests the battery 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 closed-circuit voltage reaches cut-off
volts. For the LR1 test, batteries shall be discharged at 135 milliamperes to 6.5
volts, followed by 1.7 watts to 1 volt.
Forced Discharge: After discharge to zero volts on the I capacity test, batteries
shall be force discharged at 2.0 amperes for a minimum of 5 minutes.
Overload: Batteries shall be discharged at 4.0 amperes.
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