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This life test simulates automotive service where the battery operates in a voltage regulated charging system. This test subjects the battery to charge and discharge cycles resulting in failure modes comparable to those encountered in automotive service. 1 The battery is tested in a water bath maintained at 105 ± 5 F. 2 The test cycle is performed as follows: Discharge: 2 min at 25 A Charge: (a) maximum voltage — 14.8 (b) maximum rate — 25 A (c) time — 10 min 3 The battery is continuously cycled for 100 h (for example, Mon day noon until 4:00 p.m. Friday).