IEEE Std 1188a-2014 pdf download – IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications Amendment 1 : Updated VRLA Maintenance Considerations.
5. Maintenance 5.2 Inspection Insert the following paragraph at the end of the paragraph in 5.2: If a monitoring system is installed, some of these readings can be obtained automatically. Activities such as visual inspections will always need to be completed manually. See IEEE Std 1491 for more information. 5.3 Corrective actions Insert the 5.3.3 immediately after 5.3.2: 5.3.2 Special Recovery Process Structurally intact cells exhibiting PCL (Premature Capacity Loss) may have their useful life extended by a special recovery process. This process is applicable for absorbed glass mat (AGM) type VRLA cells only (see C.8). 7. Procedure for battery tests 7.3 Test length and discharge rate 7.3.2 Discharge rate Change the second paragraph as shown:
In the previous 1996 revision of this recommended practice, the discharge rate for the time-adjustment method was adjusted for cell temperature before conducting the test. This previous method of temperature compensation is acceptable. In this revision, the time-adjustment method is revised to apply the temperature correction to the capacity calculation after completion of the test. Users may transition to this new method at an appropriate time, for example, at battery replacement. 7.4 Capacity test methods 7.4.2 Time-adjustment method 7.4.2.1 Temperature factors Change the first paragraph as shown: In the previous 1996 version of this recommended practice, the discharge rate for the time-adjustment method was adjusted for cell temperature before conducting the test. This previous method is acceptable. In this version, the temperature compensation method is revised to apply the temperature correction to the capacity calculation after completion of the test. Users may transition to this new method at an appropriate time, for example, at battery replacement. 8. Battery replacement criteria Insert the following text after the first paragraph: If a battery delivers capacity at less than 80% of rated capacity during the battery’s expected service life, contact the battery manufacturer for possible corrective actions (see C.8).