Help me find the problem with focus whistler 2

Sergi

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Focus whistler 2 stopped turning on...I measured the battery at the output and there is no power there
The lights show that the battery is charging but there are no volts at the output
I would like to find a reason or at least a diagram) has anyone encountered this?
And the green light on the BMS board flashes quickly
Derby Cycle 170418006 10INR19/66-2
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