MIL-PRF-8565/5B(AS)
REQUIREMENTS:
1. Part or identifying number. The part or identifying number (PIN) of the batteries covered by
this specification sheet shall be D8565/5-1 for figure 1 and D8565/5-2 for figure 2.
2. Dimensions and weight. The dimensions of the battery shall be as shown on figures 1 and 2 of
the specification sheet. The weight of the battery shall be not greater than 36.4 kilograms (see
3.8.3 and 4.5.3). In addition, the weight of any production battery shall vary by not greater than
± 1.0 kg from the average weight of the three approved qualification sample batteries but may not
exceed the 36.4-kilogram limit.
3. Capacity. The rated capacity of the battery shall be not less than 30.0 ampere-hours (Ah). See
3.8.6 as modified herein.
4. Service life. The battery's service life (useful life) in aircraft shall be not less than 3 years. The
battery shall require no scheduled maintenance during the 3 years (see 3.8.9, 4.5.10, and 6.15.10).
5. Qualification inspection and conformance inspection. Table I lists the required inspections.
6. MIL-PRF-8565 variance. The battery shall comply with MIL-PRF-8565 except as follows.
6.1 The following paragraphs are not applicable:
3.6.5 Marking for batteries with heaters.
3.8.16 Output performance.
3.8.17 Cold and hot temperature charge.
4.5.28 Output performance test.
4.5.29 Cold and hot temperature charge test.
6.2 Modify the following paragraphs:
3.5.5 Receptacles. Insert the following after the first sentence: "For D8565/5-1, the female
receptacle (front side) shall be dimensionally equal to MS3509, style 1. For D8565/5-2, the
female receptacle shall be dimensionally equal to figure 3 of the specification sheet. The
receptacle may be integrally molded in the container."
3.8.6 Capacity and electrical performance. Delete the text and insert: "The rated capacity of
the battery shall be not less than 30.0 ampere-hours. To meet the capacity requirement, each
battery shall produce a potential of not less than 18.0 volts at not less than 60 minutes when
connected to a 30.0-ampere load after being tested in accordance with 4.5.7 at 21°C (70°F)
(30.0 Ah/1.0 hr/21°C/18.0 V at end of life). The battery's 1C-rate shall be 30 amperes (see
requirement 3 of the specification sheet)."
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