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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Considering i can't find the batteries on the internet, what should i do? how can i test those components? Thank you so much everyone!

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alti94, by tension are you referring to voltage? Have you checked to see if you have power at R1? Have you checked continuity from B- to the black cables?

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hi! thank you for your answer! yes by tension i mean voltage.Yes, from b1- to the black cables i have voltage- How can i see if i have power r1? I'm not really good using the tester but i tell you what i did: put one of the tester cable to one side of the resistance (considering the last photo on the left side) and the other cable to that small circe at the low right corner, that i suppose is the ground. Is that right for checking if i have power to r1?

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