My controller no longer charges and the LED does not light up either (I still have a battery, but it still does not charge). I disassembled the controller and checked a few contacts, but found nothing conspicuous, should I buy a new battery or a new USB connection board (JDS 040).
Quite blunt: Did you use a different cable or a different docking station for charging?
Yes, I checked 3 different cables and both USB ports on the Playstation and one port on my PC.
The battery shouldn't be the problem. I would advise you to get a new board.