MIL-PRF-29595A
specification sheet. State of charge indicators, when applicable, shall be checked before and
after each test of section 4 and be accurate within ±10 percent.
3.9.7 Built-in test. The battery shall have provisions to perform built-in tests (BIT) to
indicate that the battery's electronics are operating properly. BIT shall be performed when
commanded by an external means such as an RS485 bus. The battery state of health and state of
charge shall be checked when the BIT is performed. The BIT shall be tested in accordance with
the applicable specification sheet.
3.9.8 Open circuit voltage. The cell or battery open circuit voltage shall be not greater than
29.0 volts before being tested in accordance with 4.5.4.
3.9.9 Capacity and electrical performance. The capacity (see 6.14.1 and 6.14.9) shall be as
shown on the applicable specification sheet. The discharge requirements and associated
parameters shall be as shown in table III (see 6.9). The battery shall produce not less than the
cutoff voltage (see 6.14.3) at the designated discharge rate (see 6.14.2) for not less than the
indicated length of time at the listed temperature after being tested in accordance with 4.5.8.
Battery capacity shall vary not greater than 5 percent within a given inspection lot. The
tolerance of the discharge current shall be 1percent of the specified value. The cell or battery
temperature shall be not greater than 82° C (180° F) at any time during a capacity test. The state
of charge indicator shall produce the proper indication corresponding to the battery capacity at
the states of highest charge and lowest charge (i.e., at cut-off voltage) before and after the test of
4.5.8. Indications at intermediate levels shall be as specified in the applicable specification
sheet.
3.9.10 High and low voltage charge test. The battery shall produce no less than 80% of its
capacity after being tested in accordance with 4.5.9.b. The battery shall produce not less than
100 percent of its capacity after being tested in accordance with 4.5.9.f. At all times during the
charge and discharge of 4.5.9 the battery shall conform to the requirements of 3.8.1.
3.9.11 Strength of receptacle (MIL-PRF-18148/3 or equivalent). The receptacle shall
withstand a torsion force of 8.1 0.7 Newton-meters (6 0.5 foot-pounds) after being tested in
accordance with 4.5.10. The battery shall also meet the requirements of 3.8.1.
3.9.12 Cycling. The battery shall successfully complete not less than 600 cycles or the
number of cycles specified in the applicable specification sheet (see 6.14.4) after being tested in
accordance with 4.5.11. The inability of the battery to meet the requirements of table III, for the
respective temperature requirement, for three consecutive discharges shall constitute a failure.
3.9.13 Functional discharge. The battery potential shall be not less than 20.0 volts at not less
than 3 minutes into the discharge after being tested in accordance with 4.5.18, 4.5.26, 4.5.28,
4.5.29, 4.5.30 through 4.5.33.
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