So I reactivated mine with a laboratory power supply unit without opening the part. Set 13 V and 0.5 A on the power supply unit. Connect the positive pole with the red output to the battery of the Noco. Then you have to make a cable or put something together. In any case, the negative terminal of the lab power supply must be connected to the negative terminal of the USB C charging connector. In my case, after approx. 30 minutes, the switch-on was permanently lit again and a red bar was on. Then you can charge normally again. It is best not to use too much wattage. The longer the charging process, the better the BMS can balance. 5 watts is enough and the charging process will take 8 hours, but it's a must!
