According to electrek, EV Clinic, a well-known electric vehicle repair organization, issued a warning:"The LG NCM811 battery used in Tesla Model 3/Y has a much higher failure rate than Panasonic NCA batteries, and its lifespan is also significantly shorter."
Data from its repair center shows that the American-made Panasonic NCA battery pack and the Chinese-made LG NCM battery pack are Tesla's two main higher energy density battery packs, but there are obvious quality differences between them.
"The LG NCM811 battery pack (LGES Nanjing) equipped with Tesla Model 3/Y has a very high failure rate and its lifespan is significantly shorter than the Panasonic NCA battery pack (made in the United States)."
The agency further noted that Panasonic battery packs are generally repairable,And battery failure will not occur before 250,000 miles of use, but similar products from LG are approaching the end of their lifespan when they travel about 150,000 miles.
What is even more worrying is that when they repair LG batteries, in more than 90% of cases, the battery cells cannot be repaired. This is mainly due to the general aging of the entire battery module, rather than the failure of the battery pack due to damage to a single cell.
In addition, they also found that LG batteries usually exhibit extremely high internal resistance. "The resistance of a failed Panasonic battery is about 28mΩ, but the internal resistance of new LG batteries, 15 out of 46 batteries, will exceed 100mΩ, and the remaining 30 batteries will exceed 50mΩ."
EV Clinic said that when they were studying whether the LG NCM811 battery could be repaired sustainably, they incurred monthly operating losses of more than 20,000 euros. However, they can responsibly say that the failure of the LG NCM811 battery was catastrophic, and there were multiple problems that made it impossible to repair.