This standard specifies the methods for quality evaluation of safety grade lead-acid batteries (referred to as batteries) in nuclear power plants using type inspection, operating experience, or analysis methods. This standard only applies to the quality evaluation of safety grade batteries and their brackets installed outside the containment of nuclear power plants. This standard does not apply to battery charging equipment and other types of batteries. 2. Reference standard GB12727 Quality Evaluation of Electrical Items in Safety Systems of Nuclear Power Plants G13625 Seismic Evaluation of Electrical Equipment in Safety Systems of Nuclear Power Plants E525 Maintenance, Testing, and Replacement Guidelines for Large Lead Acid Batteries in Nuclear Power Plants EJ/T641 Overview of Capacity Determination of Large Lead Acid Batteries in Nuclear Power Plants The purpose of quality evaluation is to demonstrate whether the battery pack and its support can meet their safety requirements throughout the entire evaluation life cycle. According to EJ525, it is recommended to replace the battery when its capacity is less than 80% of the manufacturer's rated capacity. Therefore, it is necessary to conduct a discharge test on used batteries that can release at least 80% of their rated capacity after an earthquake. Quality appraisal can be completed through type inspection, operating experience, or analysis methods, and any one of these methods can be used separately or in combination. Tracking and identification can be used to extend the qualified life of batteries. But for each method, it is required to prove its rationality