MIL-PRF-29595A
b. The rated current of each heater control device shall be compatible with the current
specified in the applicable battery specification sheet.
c. Heater elements and wire assemblies shall be electrically insulated and installed in a
manner which minimizes potential battery damage due to electrical shorting, sparking, or other
electrical hazards.
d. All electrical switches, controls, circuits, and installations shall be explosion-proof.
When operating, they shall not ignite explosive mixtures of hydrogen and oxygen gasses
generated inside the battery container.
e. Both primary and secondary (backup) temperature limiting controls shall be
incorporated into the battery's electrical circuits to prevent overheating and shall be wired in
series. If the primary heater control fails, the battery shall not reach a damaging temperature.
f. All thermal switches shall be snap-action type in accordance with MIL-PRF-24236.
g. All heater components shall be located inside the battery container.
h. When the battery is operating in accordance with any specified environmental
condition (see 4.4.1), the exterior surface of the battery container shall not be greater than 75 C
(167 F) due to the heater operation.
3.6 Physical requirements.
3.6.1 Atmospheric operating conditions. Unless otherwise specified in the applicable
specification sheet, the cell or battery shall be capable of performing electrically while
encountering the environments of 3.6.1.1 through 3.6.1.3.
3.6.1.1 Humidity. The operating relative humidity shall be from 0 percent to 100 percent
including condensation.
3.6.1.2 Pressure. The operating atmospheric pressure shall range from that found at sea
level to that found at an altitude of 18,288 meters (60,000 feet).
3.6.1.3 Temperature. The operating temperature shall be from -40° C to +71° C (-40° F to
160° F).
3.6.2 Attitude. The battery shall be designed for operation in any position while meeting the
capacity, voltage and electrolyte leakage requirements (see applicable specification sheet).
3.7 Color and marking. The batteries shall conform to the requirements listed below when
examined in accordance with 4.5.2.
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