That was the shortened version... I'll expand.From what I've read (I haven't converted a car yet)...
If you're selling the vehicles I would think you'd have to sell new batteries. Since you have no idea how the batteries were treated before you got them, you can't give any guarantee to your customers how long they'll last.
In order to be profitable, We will need to sell both mods and parts.
In the beginning, the mods (conversions) will be registered and tested by use. That use also gives us the chance to make sure they are in all the right places to get exposure and notice. Then, if they perform reliably and as expected, they will be sold as used. Buyers will be informed that the batteries are used, and supplied the provenance when possible. The idea is to make them affordable. This means they should sell for about the same as a used ICE vehicle.
If I buy right at auction (and I have 25 years experience at that) , We will have more parts and batteries than we can use. We should be able to mark them up 15%, and still sell them at a good price, to others who want to DIY.