Electric vehicle battery warranty

I recently bought a Peugot Ion electric vehicle, 3 years old but with very low mileage. I am generally delighted with the car but disappointed with the battery performance so did some checks to discover it was only charging to about 80% of its advertised capacity, and seems to have 2 cells (of 88) performing much worse than the others. I think this would indicate a defective battery which should be fixed under the 5 year battery warranty. The problem is, all batteries suffer degradation in normal use, and nowhere does the warranty say exactly what constitutes a defective battery.

Is there any 'case law' regarding what an EV battery warranty should cover? I have not spoken to Peugot yet - wanted to get my facts straight first.

Asked on 30 September 2016 by cdm9955

Answered by Honest John
No specific case law that I know of. You are correct that these batteries gradually lose their capacity to hold a full charge, but if the battery in the car you bought came with a couple of failed cells then that is a fault that was present in the vehicle before you bought it and the supplier of the car is liable: www.honestjohn.co.uk/faq/consumer-rights/
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