No it isn't the same thing at all. It'd be like if you had to purchase the fuel tank separately when buying a car. That's what selling a phone without a charger is like. If people wanted free electricity with their phone purchase, your analogy would make sense but nobody has asked for that.I desperately hope that you are not as silly as your comparison.
If you like to do a comparison, it’s more like getting a gas station on top when buying a car. If this sounds stupid to you, it’s exactly what you are expecting.