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电动锂电源放电3秒，电压就从18v降到3v无法用，这是什么故障
收到一块a3电动锂电源，故障是无法充放电，经过检测输出电压18v，但是接上电子负载仪后，3秒钟电压就降到3v，处在一个低压保护状态，看看这是什么故障如何维修
电动工具电源维修大全234/417
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