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If you get 400km per charge using 88% of the battery (98% -> 10%), that's 400,000km (258,000 miles) before you're down to 90%, at which point you have likely worn out an awful lot of other things with the car.

Admitting that I have the luxury of an urban, low-driving lifestyle: I'm 50. That battery would literally last the rest of my driving life and have room to spare.

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Understanding battery degredation takes a lot of nuance. If you do nothing but charge and discharge quickly at some given temperature, you degrade to 90% in 1,000 cycles.

But the battery also degrades over time, the hotter it is the more, the higher the SOC the more. So you have to add on that calendar degradation, to that 10% loss from just charging.

Total degradation in practice will vary a lot, based on users charging and storage practices. Most of the time in practice it seems some fault will brick a battery before it degrades too much in total capacity.

The battery in my PHEV (Chrysler Pacifica) showed no appreciable degradation in eight years (and >100k miles) before being replaced under recall for a manufacturing fault last year.

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