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In modern industry and daily life, the application of VRLA batteries as emergency power sources has become increasingly widespread, such as in elevator power outage emergency leveling devices, brake release power supplies, security power UPS, and other backup power scenarios. These situations demand a high level of reliability from lead-acid batteries, so accurately determining the health status of sla batteries to prevent failure during emergencies is particularly important.           Battery Internal Resistance and Health Status: Battery internal resistance is an important technical indicator for measuring battery performance. Changes in internal resistance are directly related to the health status of the battery. The internal resistance value of a battery is taken as the average value measured within three months after it is put into use as the baseline value. If the internal resistance value is more than twice the baseline value, the battery can be judged as defective. Therefore, regularly measuring battery internal resistance and comparing it with the baseline value is an effective method for judging the health status of the battery.   Best Conditions for Measuring Internal Resistance: The internal resistance of batteries varies with different manufacturers, different batches, and different storage conditions. To ensure the accuracy of the measurement, it must be done when the battery is in a floating charge state and fully charged, using a calibrated internal resistance meter. This ensures the consistency and reliability of the measurement results.   Internal Resistance Changes and Battery Replacement: When the battery internal resistance reaches twice the baseline value, the battery life ends; when it reaches 1.5 times, the battery should be replaced. This provides clear guidelines for battery maintenance and replacement.   The Importance of Battery Numbering System: In actual use, especially in the secondary maintenance market, it is difficult to replace batteries of the same batch and group at the same time. Kaiying Power addresses this situation by assigning a unique number to each battery, allowing maintenance personnel to accurately identify and replace batteries to ensure the performance consistency and reliability of the battery group.   By regularly measuring battery internal resistance and comparing it with the baseline value, the health status of the battery can be effectively judged. Kaiying Power's numbering system facilitates the maintenance and replacement of batteries. These measures together ensure the reliability of emergency power supplies in critical moments, ensuring the safe and stable operation of industry and daily life.