I doubt if you will get any response from Tesla owners to your question, because I think you are asking about a 'problem' which for all practical purposes does not exist. I have never ever heard of any EV owner complain about loss of power. Loss of range by reduced capability of the battery pack to store energy - yes. But that is a very different thing to loss of power. I think the electronics and electric motors that deliver your electric power are pretty reliable and long lived.
Some US data on Tesla battery back life is here:
https://insideevs.com/news/723734/te...n-200000miles/
So after 300,000km your range reduces from say 450km to 380km. Whoopie-do. That is still a lot of hours at the wheel. I don't think I would be prepared to fork out $30k for a new battery pack to gain just 70km of 'tank' range. Just charge up a bit more often. The car is probably 10 years old by then anyway. You wouldn't expect a 10 year old ICE car to perform like a new one.
The other point is that if you did find your battery pack was 'underperforming', it may be possible to replace 'sick cells' rather than the whole thing. There is a Christchurch company called 'EVs Enhanced' which specialises in looking after EVs where manufacturer support interest is lacking. So maybe if I bought a 10 year old Tesla and was planning to keep it for 10 years, I think a trip down there so that they could advise me on spending a bit of money up front so that it might enhance my ownership experience might be the go.
I would have thought that when the government subsidy for buying an electric car ended, the price of electric cars would go up. However that didn't happen, I guess due the the new car market recession and the introduction of road user charges for EVs. That and the availability of a greater number of Chinese branded EVs that have lowered the price point for EV ownership anyway. So I feel as though the government subsidy is now a red herring historical issue.
I am not a Tesla owner (I drive an Hyundai Ioniq EV Series 2 hatch). But I think I am right in saying that if you want your Tesla serviced to protect your factory warranty, you have to take it to Auckland, Wellington or Christchurch. That can be 'logistically inconvenient' if you live outside of those main centres.
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