Comment The problem is the cost of the batteries (Score 1) 503
Swapping out Li-Ion batteries isn't like swapping out propane tanks. The value of a propane tank is basically $0, plus the cost of the propane. The cost structure on the batteries is exactly the opposite - the charge is essentially free, but the batteries cost thousands of dollars.
In order for battery-swapping to make sense, the same entity has to own all of the batteries, or there needs to be careful tracking and accounting for wear and tear on each battery. Otherwise, there's an economic incentive to cheat.