MIL-B-49030A
3.5.10 Jackets. The jackets may consist of either metallic or nonmetallic material. The contents of multicell
batteries shall fit snugly enough in the jackets to minimize movement of the cells. Jackets covering one or more
cylindrical cells stacked end on end, and having open top and open bottom, shall be so attached to the cells as to
prevent them from slipping out when held or shaken vertically. The bottom opening of the jacket shall be of the size
specified (see 3.1).
3.5.10.1 Metallic jacket.
3.5.10.1.1 Prior to battery fabrication. The inside of the jacket, when other than terneplate, shall be coated or lined
with an electrolyte, corrosion resistant material.
3.5.10.1.2 As a fabricated battery. The outside of the battery shall have a coating to protect the jacket from
corrosion during or at the conclusion of any of the tests specified herein. Unless otherwise specified, the contents of
the jackets shall be completely insulated from the metal. The jacket shall not become permanently distorted nor open
at any of its seams after being subjected to the test specified in 4.7.6.1. The test of 4.7.6.1 shall be applicable to
batteries weighing 5 pounds or more.
3.5.10.2 Nonmetallic jacket. When wax coating a nonmetallic jacket, microcrystalline wax or equal shall be used.
All excess wax shall be removed from the external surfaces of the jacket.
3.5.10.3 Color of jackets. The color of exposed surfaces of jackets shall match one of the following lusterless
greens: 34079, 34086, 34084, 34096, 34102, 34127, and 34128 in accordance with FED-STD-595.
3.5.11 Closure. The closure is defined as the seal of the cell or battery.
3.5.11.1 Sealing compound. When sealing compound is used for closures in batteries, the outer edge of the
sealing compound shall be approximately level with the top of the container or the top of the jacket. 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 4.7.1.1.1).
3.5.11.2 Metal or plastic covers. Metal or plastic covers for tops of cells or batteries may be used in lieu of sealing
compound provided such covers and accessory parts are not adversely affected by leakage, corrosion, or
deformation during any of 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.
3.6 Electrolyte penetration. When applicable materials are tested as specified in 4.7.2, the milliammeter deflection
shall be less than 0.225 mA during the entire test period.
3.7 Dielectric strength. When applicable materials are tested in 4.7.3, there shall be no voltage breakdown during
the entire test period.
3.8 Capacity. When the battery is tested for capacity as specified in 4.7.9, the discharge time period to termination
3.9 Electrical insulation continuity. The dc resistance between each terminal and the outer metal jacket of the
battery, shall be not less than 1 megohm, when tested as specified in 4.7.11.
3.10 Insulation resistance. The insulation resistance between any two terminals not electrically connected, and
between all ungrounded terminals and the container of the battery, shall be not less than five megohms, when tested
as specified in 4.7.12.
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