MIL-PRF-49471/12A(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 Requirements in
Hours to 18.00 Volts
I
3.4
L
1.7
H
6.8
HT
5.5
LT
1.6
IT
3.1
LR1
49.0
Initial voltage delay: During the I, H, HT, and IT discharge tests, initial voltages below the 18.00
volt minimum voltage cannot exceed a 5.0 second duration. During L and LT discharge tests,
initial voltage below 18.00 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 described in the basic
specification.
(2) Discharge:
o
Cells (forced discharge): Two cells shall be discharged at 1.0 ampere at 70+5 F to
2.0 volts. Each discharged cell shall then be connected in series to eight fresh
o
cells. Each string shall be discharged at 1.0 ampere at 70+5 F for 3.4 hours.
Batteries: For all capacity tests, except the LR1, H and HT, the batteries shall be
discharged at 1.0 ampere 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 1.0
ampere 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, batteries shall be discharged at 75 milliamperes to 18.5
volts followed by 2.5 watts to 3 volts.
Forced Discharge: After discharge to zero volts on the I capacity test, batteries
shall be force discharged at 1 ampere for a minimum of 10 minutes.
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