MIL-PRF-8565K
size of not less than 4.2 mm. The marking shall contain the required titles and information as
shown in figure 1 herein and shall be placed in accordance with the applicable specification sheet.
The lot code shall be constructed in accordance with 3.6.6. The blank area following the entry
Date First Placed in Service shall be capable of being written on with a felt tip permanent marker.
The manufacturer shall fill in the applicable information at the indicated areas. Abbreviations in
accordance with ASME-Y14.38M and acronyms are permitted.
3.6.4 Battery caution marking. The battery caution marking shall contain the required titles
and information as shown in figure 2 herein and shall be placed in accordance with the applicable
specification sheet. The lettering height shall be not less than 6.3 mm. The marking shall be in
white or black print.
3.6.5 Marking for batteries with heaters. If any exterior surface of the battery container
exceeds 49°C (120°F) when all heater elements are energized and all other battery electrical
circuits are not functioning for 1 hour, the following caution statement shall be inscribed on the
battery identification marking and battery caution marking: CAUTION HOT SURFACE
(see figures 1 and 2). The height of all statement letters shall be equal and not less than 6.2 mm.
The battery container shall also display an electrical schematic for internal heaters. The height of
the letters and numbers shall be equal and not less than 3.8 mm.
3.6.6 Lot code. The month and year that the manufacturer compiled the batteries into a
group for inspection and the lot code of the battery shall be clearly shown on the battery
identification marking. The information shall be coded such that the first two digits indicate the
month of the year, the middle two digits indicate the year (followed by a dash), and the last two
digits indicate the inspection lot (see 6.15.9) number. Months earlier than the tenth shall be
indicated by a single digit preceded by "0". When the inspection lot is compiled during the first
three or the last three working days of the month, the manufacturer is permitted to use either that
month or the nearest adjacent month as the coded month. For example, lot code 0401-12
indicates the lot was compiled in April 2001 and was the twelfth lot.
3.7 General requirements. The battery, when subjected to any tests specified in section 4,
shall not show:
a. Dimensional distortion beyond specified limits.
b. Cracking of cases or covers of either cells or batteries.
c. Radical current or voltage fluctuations during any test. Degradation of electrical
performance beyond limits specified by the requirements.
d. Mechanical failure of any part.
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