18V的电动工具电源，输出端电压19V无法充电，这也是一种常见故障
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维修一个18v电动工具电源，输出脚电压显示19V但是带负载时间很短，无法充电这也是一种常见故障，拆开做一下均压就可以，同时拆解一个超大充电器，利用人们以为大就贵的心理
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