MIL-PRF-8565/1A(AS)
"4.5.28.2 Battery discharge and charging performance at temperature extremes. This test
consists of the following steps.
"a. Test parameters: Test sample 1 at -18 °C (0 °F) with 108 VAC, 380 Hz input power to
the integral charger. Test sample 3 at 50 °C (122 °F) with 118 VAC, 420 Hz input power to the
integral charger.
"b. Charge the battery in accordance with 4.4.2 of MIL-PRF-8565. Place the battery in an
environmental chamber. Stabilize the battery at the test temperature for 16 ± 2.0 hours.
Discharge the battery at the 1.0 C-rate. Examine the battery for the requirements of 3.8.16.1 as
specified herein.
"c. Immediately after the discharge of step 4.5.28.2b of this specification sheet and with the
battery still at the test temperature, apply power to the battery's integral charger (see 4.5.28.2.a of
this specification sheet). Charge the battery for 12 ± 0.1 hours via the integral charger.
"d. At the conclusion of the 12-hour charging period, remove the battery from the
temperature chamber and return it to laboratory ambient conditions. Immediately discharge the
battery at the 1.0 C-rate. Examine the battery for the requirements of 3.8.16.1 of this
specification sheet.
"4.5.28.3 Step discharge. This test consists of the following steps.
"a. Constant potential charge each battery in accordance with 4.4.2 of MIL-PRF-8565.
Place each battery in an environmental chamber. Stabilize sample 1 at 50 °C (122 °F) for
16 ± 2.0 hours. Stabilize sample 2 at -26 °C (-15 °F) for 16 ± 2.0 hours.
"b. Discharge each battery using the values given in table IV of this specification sheet:
"c. Examine each battery for the requirements of 3.8.16.2 as specified herein.
"4.5.28.4 AC charging circuit test. This test consists of the following steps.
"a. Charge each battery for 12 ± 0.1 hours using the integral charger (115 VAC, 400 Hz).
"b. Discharge each battery at the 1.0 C-rate to a cut-off voltage of 20.0 volts. Examine the
battery for the requirements of 3.8.6 as modified herein.
"c. Charge each battery for 12 ± 0.1 hours using the integral charger (115 VAC, 400 Hz).
Place each battery in an environmental chamber for 30 ± 1 days. The temperature for sample 2
shall be -26 °C (-15 °F) and for sample 3 shall be 50 °C (122 °F).
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