Constant-potential charging

Page Title: Constant-potential charging
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MIL-B-8565/15

24C

-26C

Requirement

1300 amperes

800 amperes

a. Minimum Current at Peak Value

(Time = 0+)

b. Minimum Current after 15 seconds

1000 amperes

450 amperes

c. Minimum Capacity delivered after

13.67 ampere-hours

5.93 ampere-hours

60 seconds

Inability to deliver the specified minimum discharge current and capacity shall constitute a test failure."

3.6.10 Life. Delete and substitute the following: "Batteries delivered under this specification shall be

capable of at least 4 years of service life, demonstrated by successfully completing the cycling test of

4.6.13.1."

3.6.10.1 Life cycling (type 1 battery). Delete "eighty-five (85)" and substitute "one hundred thirty-five

(135)".

4.5.1.3 Constant-potential charging. Delete and substitute the following: "Unless otherwise specified, the

battery shall be charged at a constant potential of 28.5 0.1 volts for 4.0 0.1 hours with a power source

having a current limit of 25 1 amperes."

4.6.9 Constant current conditioning charge. Delete "18.0V" and substitute "20.0V".

4.6.10 Capacity discharge. Delete "18.0 volts" and substitute "20.0 volts".

4.6.13.1 Cycling test (type 1 battery). Delete "85 cycles" and substitute "135 cycles". Delete "2-hour

charge" and substitute "4-hour charge".

4.6.14 Capacity discharge at 49C (120F). Delete "18.0 volts" and substitute "20.0 volts".

4.6.15 Charge and discharge test at low temperature. Delete "18.0V" and substitute "20.0 volts".

4.6.18 Mechanical shock. Delete and substitute the following:

"4.6.18.1 Functional shock. The battery shall be subjected to the functional shock test, procedure I,

method 516.4 of MIL-STD-810. The test shall consist of 15 impacts, three in each direction of each

orthogonal axis, except that which would place the battery in an inverted position. The shock pulse shall

be in accordance with figure 516.4-4 using amplitude (a) and time duration (c). The battery shall be

discharged at the C/2 rate during the test and, after each shock, shall be checked for any failure. No

resilient mounting shall be provided for this test. At the conclusion of the test, the battery shall meet the

specified requirements of 3.6.11 and 3.6.12.

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