Teufel Rockster Charge Control Repair

My Teufel Rockster has developed a power-related fault: the internal 12V battery no longer charges while the unit is connected to 230V Power. The former Owner, told me he may accidently reversed the polarity. I dont know however if he did that on the internal 12v battery clamps or on the external 12v power supply connector, for which i dont have a cable. Summary: The unit is working on internal 12v Power and 230V Power, but the 12V Battery isnt charging (Battery has of course been replaced) --- I need an experienced electronics technician troubleshoot the board, replace or re-solder any failed components, and confirm safe charging and normal power-up behavior. You will need solid bench-level skills (multimeter, oscilloscope, hot-air rework, fine SMD soldering) and a methodical approach to battery management circuitry. If you have Teufel service documentation or similar experience with lithium-ion BMS boards, that’s a plus. Deliverables • Diagnose the root cause • If economical repair or replace defect components • Evidence of success: photo or short video showing the Rockster charging to 100 % I can ship the unit to you securely and will cover return shipping once the repair is verified. Let me know your estimated turnaround and any questions you might have.

Project ID: 40738461

Location: Höhnhart, Österreich