Just looking at maybe changing my E350e for a 530e - Merc don’t seem too interested in doing a reasonable deal this time. In researching the 530e I came across BMW’s battery warranty - interestingly they cover loss below 70% in 6 years or 60k - Merc don’t cover that The BMW PHEV Warranty includes a BMW PHEV Battery Warranty against failures of the high voltage battery as a result of manufacturing defects. In addition to the BMW PHEV Three Year Unlimited Mileage Warranty, the high voltage battery is warranted for up to six years from the date of first registration, or up to 60,000 miles, whichever occurs first. The capacity of a lithium-ion high voltage battery naturally decreases over the period of use due to inherent technical reasons (natural wear and tear). Should a capacity check at a BMW Service Authorised Workshop within the warranty period mentioned above show that the net battery capacity has dropped below 70% of its original value at delivery of the new BMW PHEV, the portion below 70% will be regarded as excessive capacity loss. This excessive capacity loss will be repaired free of charge under the terms of the BMW PHEV Battery Warranty.