MIL-B-18F
4.7.5 Strap handle strength. The sample battery, or a strap handle attached to a metal plate (mockup), shall be
supported by the strap handle. The battery or the mockup shall be conditioned for 6 hours at a temperature of 130 °F
±5 °F (54.4 °C ±2.8 °C) and ambient relative humidity. Immediately following the conditioning, a weight shall be added
gradually in such a manner that the total weight (including the total weight of the battery, if used), applied to the strap
handle and its anchorages, shall be at least 80 pounds; and it shall be maintained for 1 minute. This test shall be
repeated after the battery or the mockup has been conditioned for 6 hours at a temperature of -40 °F ±5 °F
(-40 °C ±2.8 °C). The strap handle shall be examined for evidence of breakage or separation from its anchorage (see
3.7.10).
4.7.6 Jackets.
4.7.6.1 Metallic jackets. Metallic-jacketed batteries, weighing five pounds or more, shall be loaded by applying
weights totaling 100 pounds, evenly distributed over the top of the battery, and shall remain so loaded at least one
minute. The condition of the jacket shall then be observed (see 3.7.11.1.2).
4.7.6.2 Jacket integrity (JI). All multicell batteries and paper-jacketed, single-cell batteries shall be immersed to
with .25 inch (6.35 mm) of the top of the jacket in water maintained at a temperature of 113 °F ±5 °F (45 °C ±2.8 °C) for
a period of 48 hours. In the case of multicell, metal-jacketed batteries the metal containers, without covers, may be
subjected to this test in place of assembled batteries. In the case of nonmetallic-jacketed batteries, the jackets may be
applied to dummy batteries in place of actual batteries. The jackets shall be examined for evidence of water
penetration for metallic jackets and that seams are still intact and jackets are not falling apart for nonmetallic jackets,
and that labels remain legible and intact (see 3.7.11.3).
4.7.7 Battery voltage (see 3.7.2).
4.7.7.1 Open-circuit voltage. A direct-current voltmeter of proper range and sensitivity shall be used to measure
the closed-circuit voltage (see 3.7.2.2).
4.7.8 Vibration (applicable only to multicell batteries). Each battery shall be rigidly clamped to the platform of a
vibration machine in a manner approximately as closely as practicable to the manner in which the batteries are clamped
when in use. A simple harmonic motion, having an amplitude of .03 inch (0.76 mm) (.06 inch (1.52 mm) maximum total
excursion), shall be applied. The frequency shall be varied at the rate of 1 Hertz (Hz) per minute between the limits of
10 Hz and 55 Hz. The entire range of frequencies and return shall be traversed in 95 ±5 minutes for each mounting
position (direction of vibration) of the battery. The batteries shall be vibrated in three mutually perpendicular directions,
for approximately equal periods. One of the directions of vibration shall be perpendicular to the terminal face of the
battery. Open-circuit voltage shall be observed for 30 seconds during the last quarter of each vibration period (see
3.10).
4.7.9 Mechanical shock (see 3.11). Batteries shall be tested in accordance with method 213 of MIL-STD-202.
The following details shall apply:
a.
Test condition letter: I (100G sawtooth).
Examination after test: Dimensions and visual and mechanical requirements (see 3.7.1 through 3.7.2.2 and
b.
4.7.10 Insulation resistance. Batteries shall be tested in accordance with method 302 of MIL-STD-202. The
following details and exceptions shall apply:
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