SAE J240_197105

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.1The battery is tested in a water bath maintained at 105 ± 5 F.2The test cycle is performed as follows:Discharge:2 min at 25 ACharge:(a)maximum voltage — 14.8(b)maximum rate — 25 A(c)time — 10 min3The battery is continuously cycled for 100 h (for example, Mon day 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.4The battery is given a 60 h stand on open circuit in the water bath.5Discharge 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.6Replace battery on the cycling test without a separate recharge. Start on the “charge” portion of the cycle.7The 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).The point of failure shall be determined by plotting the 30 s discharge voltage values.8Water 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.