But for gas you don’t need to worry ownership problem as you can’t reuse gas. Once it is burnt, it’s gone.
Batteries are different because you can recharge it, which brings ownership problem into sight. And unlike gas tank for your grill, which the port is somewhat universal and shape doesn’t matter too much. Car batteries have wear level that affects performamce (range) and are likely designed to fit a car/platform. It isn’t that interchangeable.