JBL charge 2 battery problem circuit with photos

JBL charge 2 battery problem circuit with photos

Hi everyone, i have got the issue with a JBL charger 2, the problem seems to be that the battery give tension but it is stopped by this small circuit board that manage power source. Here is the photos. If i check the 4 battery pins with a multimeter i detect tension but it does not arrive to the cables.

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