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Due to the small current, using this method to measure will not cause significant damage to the battery itself.

The measurement accuracy of the AC voltage drop measurement method is not as good as that of the DC discharge internal resistance measurement method.

Different testing methods emphasize different application environments. Corresponding testing methods should be selected based on different application environments. The internal resistance value of a battery varies with different SOC and discharge current, so generally speaking, internal resistance refers to the internal resistance when fully charged. Especially for power lithium batteries, the internal resistance should be tested for changes throughout the entire charging and discharging process, with the most stable range being between 70% and 30% SOC.

One final reminder

When testing the internal resistance of the battery, it is necessary to consider the stability and accuracy of the testing equipment. The internal resistance of the battery to be tested is already very small. If other variables such as reasonable error, circuit conditions, and surface to surface contact are introduced into this complex system, it will have a significant impact on the test results.

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