Finally, the first EQS 450+ with a faulty CATL battery, at 300,000 km. CATL is otherwise the only cell manufacturer with a system so reliable that it doesn't even need service centres in Europe, because the failure rate is minimal compared to LG cells, which have proven to be extremely critical in practice. EOLHC is the most likely end of life for this battery, not a cell failure itself. A new battery is no longer offered by Mercedes at all, and a "Refurbished" one is around €55,000, which is unrealistically expensive. Our visit to CATL headquarters gave us an insight into the likely purchase price of the cells, which is probably in the range of €12,000, while the housing and the rest of the pack make up the remainder of the cost. Used batteries go for €7,000 to €14,000.
Part number: A7893400027
Defect: damaged cells, self discharge delta
Now lets build diagnostic bench protocol, repair manual and training material.