MIL-B-18F
3.7.11.2 Nonmetallic jacket. When coating a nonmetallic jacket with wax, microcrystalline wax, or equal, shall be
used. All excess wax shall be removed from the external surfaces of the jacket.
3.7.11.3 Jacket integrity (JI). When tested as specified in 4.7.6.2, metallic jackets shall show no evidence of water
penetration and nonmetallic jackets shall not fall apart and the seams shall remain intact. The JI requirements shall
not apply to single-cell non-rechargeable dry batteries with metallic or plastic jackets.
3.7.11.4 Color of jackets. The color of exposed surfaces of jackets shall match of the following lusterless greens:
34079, 34086, 34087, 34096, 34102, 34127, and 34128 in accordance with FED-STD-595.
3.7.12 Closure. The closure is defined as the seal of the cell or battery.
3.7.12.1 Sealing compound. When sealing compound is used for closures in batteries containing cells whose
seals are exposed, the outer edge of the sealing compounds of such cells shall be approximately level with the top of
the jacket, and the inner edge of the sealing compound shall be approximately level with the lower edge of the cap on
the carbon element. On multicell batteries, the exposed sealing compound shall be approximately level with the edge
of the jacket and shall not obstruct the contact surfaces of the terminals (see 4.7.1.1).
3.7.12.2 Metal or plastic covers. Metal or plastic covers for tops of cells or batteries may be used in lieu of sealing
compound, provided that such covers and accessory parts are not adversely affected by leakage, corrosion, or
deformation during the tests specified herein. Construction shall be such that it shall be impossible for one cell to be
short-circuited by coming in contact with another cell of the same type when placed end to end.
3.7.13 Potting. When potting is specified (see 3.1), voids within the battery, except the socket well, shall be
adequately filled with microcrystalline wax, asphalt, wood blocks, or wax-impregnated chipboard, or equivalent material
(see 4.7.1.1).
3.8 Electrolyte penetration. When applicable materials are tested as specified in 4.7.2, the milliammeter deflection
shall be less than 0.225 milliampere during the entire test period.
3.9 Dielectric withstanding voltage. When applicable materials are tested as specified in 4.7.3, there shall be no
voltage breakdown during the entire test period.
3.10 Vibration. After the multicell batteries have been tested as specified in 4.7.8, they shall meet the visual and
mechanical requirements (see 3.7.1 through 3.7.2.2 and 3.7.9 through 3.7.9.7). There shall be no voltage fluctuations
during the test.
3.11 Mechanical shock. After the multicell batteries have been tested as specified in 4.7.9, they shall meet the
3.12 Insulation resistance. The insulation resistance between any two terminals not electrically connected, and
between all ungrounded terminals and the jacket of the battery, shall be not less than five megohms, when tested as
specified in 4.7.10.
3.13 Capacity. When batteries are tested for delayed capacity (D) and capacity after high-temperature store (T),
as specified in 4.7.11, the time required to terminate the discharge, as specified in 4.7.11.4, shall be not less than the
minimum time specified for SLD or SLT.
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