I'm answering my own question as I was able to dismantle the controller and fix the issue.
the problem is that there's a gap of about 3 or 4 milimeters between the socket on the controller and the female part on the battery.[br]
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[image|3422950]
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I managed to scrap a little bit of the plastic from the limit of the battery line
[image|3423003]
I also put a little piece of metal on the affected socket to amplify the contact with the pin[br]
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[image|3423013]
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and bent a little bit the affected pin to increase the pressure on the metal part of the socket.