instead of building and selling a car for every owner who throw will it away after its no longer functional (for ex. battery degradation, etc), spend more in quality per car and recoup teh expense by renting the device to customer so that when the person dies or wants to stop owning teh device they return it with legal binding to do so in the purchase contract, rather than sell on used market or trash it. after its fixed if any damage exists (which is unlikely given more is spent on high quality. only replace parts that need to be replaced. make them pay for damages according to the legal purchase contract to incentivize keeping it in good condition so that u dont waste money/materials/time fixing a lot.) then rent it to someone else, and repeat the cycle.
if the legally binding contract cant happen for legal reasons, then incentivize returning the car and keeping it in good as new condition by giving some part of the money paid back if they return the car, the better the condition the car more they get back, or something like this. you can remind the customer of the incentive to keep the car in good shape and return it by putting a reminder on the bill message or by auto emailing twice a year or something. https://www.aptera.us/forum/aptera-design-discussion/increasing-average-efficiencies-by-rental-of-usually-uneeded-things