MIL-PRF-29595A
3.9.14 Electromagnetic interference. The battery shall not exhibit any malfunction or
degradation of performance. The battery shall meet the applicable requirements of
MIL-STD-461 after being tested in accordance with 4.5.12.
3.9.15 Temperature rise and float. The battery shall perform as follows after being tested in
accordance with 4.5.15. If the charging current rises, its increase (in amperes) compared to the
current's minimum value shall be not greater than 10 percent of the battery's rated capacity (for
example, 1.5 amperes for a 15-ampere-hour battery) at any time during charge. The battery shall
meet requirement (1) of table III and the requirements of 3.8.1.
3.9.16 Penetration test. Batteries shall not fail violently when their containers are penetrated
by sharp objects. Samples tested in accordance with 4.5.38 shall not explode nor create shrapnel.
When tested in accordance with 4.5.38.a, the temperature of each test sample shall be not greater
than 170° C (338° F).
3.9.17 Crush test. When tested in accordance with 4.5.39 the cell or battery shall not
explode nor create flame or fire within 24 hours after the completion of the test. The cell or
battery shall not produce shrapnel within 24 hours after the completion of the test.
3.9.18 Ground storage. The cell or battery shall be capable of storage in uncontrolled
temperature conditions from -40 C to +50 C (-40 F to +122 F) for not less than 30 days, after
which it shall deliver not less than 50 percent of rated capacity after being tested in accordance
with 4.5.36.
3.9.19 Shelf life. In order to maintain qualification, successful completion of the shelf life
test shall be required. The cell or battery shall be capable of storage in uncontrolled temperature
conditions from -40 C to +50 C (-40 F to +122 F) for not less than 18 months without
damage (see 6.2.f). The capacity shall be recoverable after being tested in accordance with
4.5.37. The cell or battery shall also meet the requirements of 3.9.12 after being tested in
accordance with 4.5.11.
3.9.20 Deep discharge recovery. If the battery uses protective circuitry to protect it from
deep discharge, the battery shall meet the test requirements of 3.9.20.a. Otherwise the battery
shall meet the test requirements of 3.9.20.b.
a. If the battery uses protective circuitry (the battery while under load), the protective
circuitry shall allow the battery to discharge down to 20.0 volts before stopping the discharge. If
protective circuitry is utilized to stop the discharge, there must be a time delay of 30 seconds
before the battery is removed from the DC bus to allow for voltage dips below 20.0 volts during
engine starts. If at any time during the 30 second time delay the battery voltage is greater than
20.0 volts then the 30 second timer shall be reset. If the battery open circuits at 20.0 volts, the
battery must stay off line (no on-off-on-off chatter) until a charge voltage of not less than 24.0
volts or greater is applied to the battery terminals.
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