MIL-B-18F
a.
Test condition letter: B, except that tolerance is ±20 volts.
b.
Special preparations and conditions: Batteries shall be stored for a period of 48 hours at 70°F ±5 °F (21.1 °C
±2.8 °C) and a relative humidity of 50 ±15 percent. The insulation resistance measurement shall be made at
the end of this storage period and while at these storage test conditions.
c.
Points of measurement: Between any two terminals not electrically connected and between all ungrounded
terminals, for all batteries; between all ungrounded terminals and the metallic jacket of the battery for those
batteries having a metallic jacket. For batteries having a nonmetallic jacket, the measurements shall be
made between a 1 inch (25.4 mm) square copper plate in physical contact with the jacket and all ungrounded
terminals. The copper plate shall be placed with its broad surface against any area of any surface other than
the one on which the battery terminals are located (see 3.12).
4.7.11 Capacity. Sample batteries marked "RESERVED FOR (D or T) TEST. DO NOT OPEN UNTIL
COMPLETION OF STORAGE PERIOD", shall be stored conditioned, if applicable, and discharged as specified in
4.7.11.1 Ambient storage and discharge conditions. The ambient conditions specified in table X shall prevail
during storage and discharge periods. Normal conditions shall be maintained insofar as possible. Deviations from
normal conditions are permitted, provided that:
a.
The extreme conditions specified in table X do not exist for more than five percent (cumulative) of the
specified storage or discharge periods (see 3.1)
b.
That at no time are the extreme conditions exceeded which shall adversely affect the battery.
4.7.11.2 Storage. At the Government inspection facility (see 6.2e), the sample batteries (as received in
container-barrier containers) shall be stored at applicable storage conditions for the specified period (see 3.1). For D
test, the storage period shall be considered to have started from the coded month appearing on the battery label. For
the T test, the storage period shall be considered to have started from the date the batteries are actually placed in
controlled storage. At the conclusion of the storage period, the outside of the metallic jackets shall be examined for
evidence of corrosion (see 3.7.11.1); non-metallic jackets shall be examined for their condition (see 3.7.11.3).
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