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电动锂电源买来就无法用，检测电池组正常，保护板被维修损坏
购买了一个号称原装的，大艺A3电动锂电源，回来就无法使用，检测发现电池组功能正常电压20v，保护板输出端只有18v，无法充放电，原来这个保护板被维修过，没有修复成功
电动工具电源维修大全258/417
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