Toyota only warrant their hybrid batteries (the same type as full EV batteries but less of them) for 5 years/100k miles, the same as the rest of the car. They have a policy which can extend the warranty for that battery system per year up until it's 15 years old (with an annual mileage stipulation), but I suspect that only covers actual failures, not a general loss of performance (charging capcity) due to how old the batteries are.
Nissan's 75% battery capacity warranty is for 8 years or 100k miles, whichever occurs first. The rest of the EV system is only warranted for 5 years/60k miles, whichever comes first.
That means that, for an older car, the battery capacity could drop off the proverbial cliff, and the new owner who probably paid only a few Grand for the car now has to fork out £7k+ for a new set, which means either they were stupid to pay that much for a car that could require them to part with a huge amount of cash (that they may not have) to keep it on the road, or accept having to charge it up at very small distance intervals and waste their time doing so. What a great incentive to buy an older one!
The problem with EVs, unlike with ICE enged cars, is that they are more reliable and require less maintenance in the first 5 years of so of their lives, then require a huge amount of investment to keep them viable in a short time - whilst the total might be less than an ICE car during its life, the bills are spread over that time and don't come in big chunks.
I think that's why EVs depreciate far more than ICE vehicles because people reaslise some unlucky person will have to foot the (very hefty) bill for a new battery pack and/or motor set, and thus they aren't prepared to pay much for the car once it is within a couple of years or the end or out of warranty - the value drops like a stone, just like expensive perforamce luxury saloons and sportscars. Many people find out the hard way that these can be veritable money pits (and terminal ones) should an expensive major component fail and need a replacement.
The problem is that, to make them economically viable from new, you have to do a LOT of mileage, which means the warranty gets used up far quicker. Not so bad for a hybrid because the ICE engine is there, but still will be a disadvantage because its using engine power to lug around the extra weight of the batteries and motor that may only give a very limited (marginal) benefit when they get older.
A well designed and looked after ICE car will not require a new engine in its lifetime.
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