MIL-PRF-29595A
this specification. With the battery vent ports open and the battery operating within design
requirements of this specification, cell venting shall not cause liquid discharge from the battery.
Products of cell venting that are discharged through the vent tubes shall be non-toxic.
h. Breakdown of insulation, flashover, arcing, stripping of metal plating from any
component part, corrosion of metal parts, or loosening of protective coating from the battery
container or cover.
i. Deterioration of cell or battery identification markings.
j. Charred or discolored areas of the cell or battery.
k. Opening of cell or battery vents.
l. Cracking, pitting, chipping, scaling, corrosion, or other deleterious effects on the
external and internal metal or component parts of each cell or battery.
m. Cracking, peeling, fading or discoloration of the container and battery markings.
n. Improper indication by state of charge indicator or other state of health indicators.
3.8.2 Thermal protection. When required, thermal protection shall conform to the applicable
specification sheet. The thermal protection shall remain closed below 82 ±2° C (180 ±4° F) and
shall remain open above 88 ±2° C (190 ±4° F) after being tested in accordance with 4.5.17. The
thermal protection shall be located as close as possible to the geometric center of the battery or
as delineated in the applicable specification sheet. For a two- or three-cell in-line arrangement,
the thermal protection shall be located between any two adjacent cells. For a cluster arrangement
of three or more cells, the thermal protection device shall be located within the cluster.
3.8.3 Potting. Cell or battery vents shall not be potted over. If potting is essential, care shall
be exercised to ensure that venting shall not be obstructed. Potting shall not adversely affect cell
or battery thermal management.
3.8.4 Pressurized cells or batteries. All internally pressurized cells shall be hermetically
sealed and constructed so that the case-to-cover seal is continuous, free from holes and other
imperfections. The seal between the electrode and the cover shall be free from imperfections.
Each cell, battery, and battery enclosure shall incorporate a safety venting device or be designed
and manufactured so as to preclude a violent rupture as a result of cell venting. The design and
construction shall not degrade the vent.
3.8.5 Interchangeability restraints. Lithium batteries with two or more cells shall be
constructed so that they are not interchangeable with alkaline batteries used in consumer
products such as flashlights or radios.
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