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BQ25606无输出

接上电池后

1.不接负载时,芯片VSYS输出正常.

2.接上负载后,VSYS立即降到0.

使用直流源代替电池,接在电池接口上,芯片VSYS都处于正常状态.

电池为2节18650并联,电池电压4V左右,保护板放电电流大于4A,系统负载小于100mA.

这会是什么原因呢