A number of straws in the wind.I don't see these problems, Tesla's backup is without equal in the e-car world. Despite the small number of their cars about in the UK at present, they have 18 stores and 12 service locations in the UK alongside a network of 50 Supercharger locations which is rapidly expanding. With the market success of their model 3 there will be further servicing expansion now.
There is no issue with sending car batteries to and from the EU, Nissan's Leaf battery production for all Europe is here at Sunderland and their EU wide dealers have mechanics trained in swapping batteries or individual cell banks. The latter goes for Renault too.
Seeing e-cars as new leads to all sorts of assumptions about possible problems, but they aren't new and the "problems" were solved long ago. The Nissan Leaf hit the market here 11 years ago. The Renault Zoe, Renault Fluence and Renault Twizy 10 years ago. The Tesla model S 9 years ago. So there's lots of experience about with many of the cars now on second owners.
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1. Nissan have officially endorsed rebuilt battery packs in Japan.
2 Hydrogen is growing in popularity as a real fuel .. Toyota have built a credible ICE vehicle using it.