MIL-B-18F
3.15.1.1 Code. The code shown, shall indicate the month and year of manufacture of the battery by means of a
four-digit number, in which the first two digits shall indicate the number of the month and the last two digits shall indicate
the year. Months, earlier than the tenth month, shall be a single digit preceded by "0".
Examples:
A battery manufactured in March 2009 shall bear the code "0309".
A battery manufactured in November 2009 shall bear the code "1109".
When a battery is completed during the last three working days of a month, or the first three working days of the
subsequent month, the manufacturer is permitted to use either month as the date to be coded.
3.15.2 Terminal markings. On batteries having socket-type terminals, all markings such as polarity, voltage, and
the unit of battery (A, B, or C) shall appear on the face of the battery bearing the socket. On other type terminals, the
terminal markings may appear on the top or the side of the battery, or both. Markings shall indicate clearly the
terminals to which they refer.
3.16 Workmanship. Batteries shall be processed in such a manner as to be free from cracked or displaced parts,
sharp edges, burrs, and other defects, which shall affect their life, serviceability, or appearance.
4. VERIFICATION
4.1 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of sufficient
accuracy, quality, and quantity to permit performance of the required inspection shall be established and maintained by
the contractor. The establishment and maintenance of a calibration system, to control the accuracy of the measuring
4.1.1 Instrument accuracy.
4.1.1.1 Voltmeters and ammeters. All voltmeters and ammeters, used in testing the batteries, shall be accurate
within one percent of the full-scale value. The voltmeter and ammeter ranges shall be such that all readings are taken
on the upper half of the scale. For all closed-circuit voltage measurements, the sensitivity of voltmeters shall not be
less than 1,000 ohm per volt. Unless otherwise specified (see 3.1), for all open-circuit voltage measurements, the
sensitivity of voltmeters shall be100 ohms ±10 ohms per volt.
4.1.1.2 Resistor tolerances. In all tests involving discharge through a resistance, such resistance shall be accurate
within the following percentages:
Percent
Up to and including 25,000 ohms - - - - - - - - - - -
0.5
From above 25,000 ohms to and including
1 megohm - - - - - - - - - - - - - - - - - - - - - - - -
1.0
Above 1 megohm - - - - - - - - - - - - - - - - - - - - - -
5.0
In determining the resistance used as a test load, the resistance of all continuously operating voltmeters shall be
considered as part of the specified load.
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