In the US, unless you are signing a contract of some sort, then a sale is a sale. Any physical object that you simply buy at the store is yours, full stop.
I don't understand the comment that you make about not owning the batteries in an electric car. If you own the electric car, then you own the batteries, that's not in question.
However, manufacturers often put measures into place that make ownership less useful:
-- They might load software into the device that makes it respond to their control, and limits your ability to use the object
-- They might restrict availability of manuals, repair parts and other information to incentivize you to use their service facilities
However, I would argue that these are not the same as infringing on your ownership.
I don't understand the comment that you make about not owning the batteries in an electric car. If you own the electric car, then you own the batteries, that's not in question.
However, manufacturers often put measures into place that make ownership less useful:
-- They might load software into the device that makes it respond to their control, and limits your ability to use the object
-- They might restrict availability of manuals, repair parts and other information to incentivize you to use their service facilities
However, I would argue that these are not the same as infringing on your ownership.