MIL-PRF-8565K
3.5.2 Batteries. After delivery from the manufacturer, batteries shall not require the addition
of any substance before being put into service. The battery shall not require any maintenance in
meeting the provisions of this specification (see 6.15.10).
3.5.3 Battery container and cover. The battery container and cover shall be free of pits,
blow holes, rough spots, and other deformations. The dimensions and locations of receptacles,
hold-downs, vent tubes, and battery identification shall conform to the applicable specification
sheet. The cover shall not be removable from the container.
3.5.4 Venting. Each battery shall include two vent tubes, located as shown on the applicable
specification sheet. Air shall flow freely into and through any vent tube, across the cells, and exit
through the other vent tube (see 3.7.e). Each vent tube shall be capable of supporting the test
sample such that the requirements of 3.8.5 are met after being tested in accordance with 4.5.5.
3.5.5 Receptacles. Each battery shall include a main power receptacle in accordance with
the applicable specification sheet as the battery's interface to the aircraft electrical system. The
hardness of the wormgear retaining pins within the sockets of receptacles which are dimensionally
equivalent to MS3509 receptacles shall be not less than 55 on the Rockwell C Scale when tested
in accordance with 4.5.30.
3.5.6 Connectors, intercell. All electrical connections within the battery shall be by
surface-to-surface conduction and not through screw threads.
3.5.7 Electrolyte leakage. Evidence of electrolyte leakage during the performance of any of
the tests specified in section 4 shall not occur except when tested in accordance with 4.5.18.
3.5.8 Voltage. Unless otherwise specified on the applicable specification sheet, the nominal
potential of the battery shall be 24 volts. The battery potential shall be not greater than 29.0 volts
at any time, except when constant current charged in accordance with 4.4.3 and when tested in
accordance with 4.5.18.
3.5.9 Operating position. The battery shall be capable of operating in any inverted position
or altitude without loss of any electrolyte after being tested in accordance with 4.5.13 and 4.5.14.
3.5.10 Heaters. Heaters may be incorporated into batteries to meet the cold temperature
charging requirements. Heater power shall not be provided during any discharge performed in
section 4. Heater power will be provided during all constant potential charges (see 4.4.2). When
heaters are incorporated, the following requirements shall apply:
a. Heaters shall be powered only by 115 volts alternating current (VAC) power in
accordance with MIL-STD-704 for batteries weighing not less than 4.0 kg. Other batteries may
use heaters powered by 115 VAC or by 28.0 volts direct current (VDC).
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