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电池电量计测的不准确?

电量计连接下载器EV2300时测得电量比较准确,但在实际应用中电量偶尔会显示错误,我将下载器与电量计连接瞬间的信号用示波器抓取出来,然后集成到自己代码,还是发现电量测试不准确,请问有什么注意的地方或者其他方法解决这个问题吗?