Yes, it would be helpful to revisit that source but it eludes me - sometimes that’s the way these things go with surfing the web.I'd be interested if you could find the source showing 10% every 5 years.
Manufacturers’ guarantees are about replacing things that they don't expect will need replacing.
Guarantee’s are encouragements to buy but with such limitations as noted in my post they highlight poor durability.
From what I read (https://www.autocar.co.uk/car-news/new- ... te-ev-2028) and articles on Nissan’s own website solid state batteries are under development and should be in mass production during or by 2028. Solid state batteries should be a ‘game changer’, but whether, as a tight fisted older person who only buys older cars, I end up with one is anyone’s guess.
I’m inclined to think any future car (of mine) will be either petrol or current technology with a large battery (large such that after anticipated degradation it will still retain a useful enough range to allow regional journeys). Green issues aside the logical choice is to stay with petrol for as long as is practical - which is well beyond my current horizons and who knows when the grim reaper will call, etc. - but do we always make logical choices? Of course, factors that are quite important to one person might be less important to another and vice versa … and our priorities can change over time too.