MIL-PRF-49471/10A(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
Battery Capacity Requirements in
Hours to 8.00 Volts
I
3.00
L
1.50
H
5.50
HT
5.30
LT
1.30
IT
2.80
LR1
45.0
Initial voltage delay: During the I, H, HT, and IT tests, initial voltages below the 8.00 volt
minimum voltage cannot exceed a 5.0 second duration. During L and LT discharge tests initial
voltage below 8.00 volts cannot exceed a 60.0 second duration.
Venting mechanism: The battery case shall incorporate a venting mechanism that shall prevent
the battery case from exploding or rupturing into fragments when cell venting occurs. The
venting mechanism shall be located at the bottom face (see Figure 2). Venting mechanism shall
not become separated from the battery case when activated by cell venting.
Watertight Integrity: The battery, when subjected to the Watertight Integrity test, shall not
increase in weight by more than 0.1 grams and no water shall come into contact with the battery
terminals. There shall be no sign of corrosion on the battery contacts.
METHOD OF EXAMINATION AND TEST:
Capacity tests:
(1) Storage: Details on storage conditions for all specified capacity tests are described in
the basic specification.
(2) Discharge:
Cells (forced discharge): One cell shall be discharged at 0.65 amperes at 70+5oF to 2.0
volts. The discharged cell shall then be connected in series to three fresh cells. Each
string shall be discharged at 0.65 amperes at 70+5oF for 3.0 hours.
Batteries: For all capacity tests, except the LR1, H and HT, the batteries shall be
discharged at 0.65 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 0.65 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 45 milliamperes to 8.5 volts, then at 0.7 watts to 1 volt.
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