Right now TESLA require people return the battery at the same station and change back their own battery to avoid additional charge. so these batteries belonging to car owner can't be used for anyone else. where they could storage so many batteries?
lets say TESLA could make 200K car each year some day later, car life time is about 10 years, then there are about 2 million cars on the road. if 5% of these cars need battery swap in the same day, they need prepare total 10K batteries in all SC stations. if they had total 500 Super charge stations in the country, each station needs prepare 200 batteries. That's two billion USD just for battery inventory. if people return battery in 3 days by average, then that's 6 billion and each station need store 600 batteries. I can't image how they can store those batteries. Battery inventory will be huge cost.
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