applestrudel
Standard Member
Fellow MG ZS EV owners,
I’m writing this to raise awareness about a potential issue with our cars that could indicate battery defects. If your 2019-2020 MG ZS EV is experiencing any of the following:
These symptoms are not a sign of normal degradation but might indicate a manufacturing defect in the high-voltage battery or charging electronics.
However, consumer protection laws in the UK (CRA 2015, 6 years of protection for manufacturing defects) and most EU countries (Austria, Germany, France, Netherlands: Up to 6 years of legal warranty protection for defects, Spain, Portugal, Italy, Belgium: 3 years of consumer warranty rights, Scandinavia (Denmark, Sweden, Finland, Norway): 5 years in most cases.) require that a product must meet the functionality and performance expected based on its advertised specifications. A significant drop in charging speed or persistent battery imbalances may constitute a breach of these consumer rights, even if MG's internal SOH calculation suggests otherwise.
Collect and document battery data properly:
Contact your national motorist's association like ADAC, AA for legal advice and support
Consult a consumer protection lawyer – many national consumer laws require manufacturers to uphold promised functionality, not just capacity metrics
Demand a full technical diagnosis from an MG-authorized service center beyond the SOH number
Report the issue publicly if possible
Know Your Rights!
I’m writing this to raise awareness about a potential issue with our cars that could indicate battery defects. If your 2019-2020 MG ZS EV is experiencing any of the following:
- Reduced DC charging speed – originally 75 kW, now stuck at 35 kW or lower
- Reduced AC charging speeds – originally 6.6 kW, now limited to 2-3.3 kW
- OBD Errors relating to EVCC: "EVCC: P1FF4 – Electrical Resistance of CC Signal Abnormal (Aging)"
- Battery cell voltage imbalance – one or more cells showing a consistent deviation of 50-200 mV even on fully-balanced batteries
These symptoms are not a sign of normal degradation but might indicate a manufacturing defect in the high-voltage battery or charging electronics.
Why This Matters
MG provides a 5/7-year / 150,000 km warranty on the HV battery. However, they only officially cover capacity loss below 70%, not necessarily charging speed drops or cell imbalances. This means MG may refuse warranty claims based on their opaque State of Health (SOH) calculations, even when the car is clearly defective.However, consumer protection laws in the UK (CRA 2015, 6 years of protection for manufacturing defects) and most EU countries (Austria, Germany, France, Netherlands: Up to 6 years of legal warranty protection for defects, Spain, Portugal, Italy, Belgium: 3 years of consumer warranty rights, Scandinavia (Denmark, Sweden, Finland, Norway): 5 years in most cases.) require that a product must meet the functionality and performance expected based on its advertised specifications. A significant drop in charging speed or persistent battery imbalances may constitute a breach of these consumer rights, even if MG's internal SOH calculation suggests otherwise.
What You Can Do
Collect and document battery data properly:- Use OBD apps (CarScanner, EVNotify, MG Pilot) or the EZS app to monitor:
- Battery cell voltage mismatches
- Temperature deviations
- Charging speed anomalies
- Track DC fast charging performance at Alpitronic (Hypercharger) or other HPC stations that provide graphical charging curves. Compare with expected values.
- Collect data in temperatures above 20°C to ensure the HV battery is in optimal charging temperature and to ensure valid data collection by avoiding artificially low charging speeds due to cold weather limitations.
Contact your national motorist's association like ADAC, AA for legal advice and support Consult a consumer protection lawyer – many national consumer laws require manufacturers to uphold promised functionality, not just capacity metrics Demand a full technical diagnosis from an MG-authorized service center beyond the SOH number Report the issue publicly if possibleHave You Experienced This?
If you have noticed similar charging issues, please share your experience in the comments! Let's help each other document these cases and push for proper warranty handling.Know Your Rights!
