MIL-B-18F
3.7.2.2 Closed-circuit voltage. The closed-circuit voltage shall be not less than the voltage specified (see 3.1 and
4.7.7.1).
3.7.3 Potting and sealing compounds. Potting and sealing compounds shall exclude moisture from insulating
material without impairing its electrical characteristics. When tested as specified in 4.7.1.1, the potting and sealing
compounds shall not flow at high temperature, nor crack or draw away from the sides of a container at low temperature
sufficiently to impair electrical connections.
3.7.4 Filler or padding. Filler or padding shall be cushioning, electrically-nonconducting material which maintains
its insulating characteristics under adverse environmental conditions. If adverse environmental conditions affect this
material, then it shall be isolated from the electrical components by an insulating material that maintains its electrical
characteristics, or the filler or padding may be impregnated with microcrystalline wax.
3.7.5 Cell-block container. The cell-block container shall be an insulating material surrounding a group or a stack
of individual cells.
3.7.6 Intercell separation. A separator shall be placed between cells in series-connected multicell batteries.
3.7.6.1 Leclanche type batteries. For Leclanche type batteries, the separator shall be an insulating material.
3.7.6.2 Mercury type batteries For mercury type batteries, the separator may be an absorbent material.
3.7.7 Intercell connection. Intercell connection between cell blocks and between cell block and terminal shall be so
insulated or positioned as to avoid contact with other conducting material. When insulated wire is soldered to terminal
lugs, it shall not be bared more than .094 inch (2.39 mm) from the lug, nor shall it extend more than .094 inch (2.39 mm)
beyond the lug.
3.7.8 Age of cells. The minimum age of cells, from the time of their fabrication to the time of their presentation for
inspection of product for delivery as batteries, shall be 5 days. The maximum age of cells, from the time of their
fabrication to the time of their shipping date, shall be 90 days. Non-rechargeable batteries shall be submitted for
inspection of product for delivery not more than 30 days prior to the shipping date.
3.7.9 Terminals. The type, dimensions, location, and mounting of terminals shall be as specified herein and in 3.1.
3.7.9.1 Stud and nut. Stud and nut terminals shall be as shown in figure 1 and shall be made of brass or of
insulated material with a brass insert, as specified (see 3.1). A bronze or brass-plated steel, externaltooth,
lockwasher shall be provided for each terminal.
3.7.9.1.1 Mounting. It shall be possible to screw the terminal nut down by hand to make a firm seat with the
shoulder of the terminal stud, without turning of the stud.
3.7.9.2 Spring clip. Spring-clip terminals shall be of the Fahnestock type, made of spring brass or phosphor
bronze, and shall be large enough to accommodate a wire having a cross-sectional area of 4,200 circular mils.
3.7.9.2.1 Mounting. Each spring clip shall be mounted in such a manner that the entire surface of the clip shall be
located above the surface adjacent to the clip.
3.7.9.3 Wire leads. Wire-lead terminals shall be hookup wire, type MW-C18(16)U or larger, as specified in
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