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When i get Sertag electronic shelf labels ,why did this battery appear to be 90 percent ?

When i get Sertag electronic shelf labels ,why did this battery appear to be 90 percent ?

Update Time:2022/9/16
The percentage of electronic shelf label battery is based on the tag voltage, which is an interval. 90% does not mean that the battery has been used, and the voltage may be just at the critical value. Please refer to the figure

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