"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 ?C 14.8 (b) maximum rate ?C 25 A (c) time ?C 10 min 3. The battery is continuously cycles for 100 h (for example@ Monday noon until 4:00 p.m. Friday). A switching delay of not more than 10 s is permitted from termination of charge to start of discharge@ and termination of discharge to start of charge. 4. The battery is given a 60 h stand on open circuit in the water bath. 5. Discharge battery at a rate equal to its 0 F cold cranking discharge rate in amperes@ at the battery temperature obtained in paragraph 4@ to an end voltage equivalent to 1.20 V per cell@ or a minimum discharge time of 30 s@ whichever occurs first. 6. Replace battery on the cycling test without a separate recharge. Start on the ""charge"" portion of the cycle. 7. The life test shall be considered completed when the battery fails to maintain 1.2 V per cell for a minimum of 30 s on the manual discharge (paragraph 5). 8. Water should be added as required during the cycling portion of the test. NOTE: This test only applies to 12 V batteries of 180 min or less Reserve Capacity."