Hard to say. We have fleets of 8 year old tesla cabs here. Many with north of 400,000 kilometres. They typically have 12 percent degradation and that’s older technology. And they get supercharged multiple times per day. I think we’ll all have to wait a decade to get a true picture of how the batteries hold up.Telsa battery warranty is 8 years. If true then maybe the trailer will come with a 30 year battery warranty and that would be a huge selling point.
The U.S. Department of Energy, meanwhile, predicts today's EV batteries ought to last a good deal past their warranty period, with these packs' service lives clocking in at between 12 and 15 years if used in moderate climates. Plan on a service life of between 8 and 12 years if your EV is regularly used in more extreme conditions.