The electric runs through the lead connected to both sides. NOT vehicle only but other system would enjoy the technology of fuel cell. From the view point of global environment, energy system should be consist of natural energy, including solar generation, and dispersion power supply system by the developed fuel cell. THE most suitable energy supply system for each area is applied by small scale power generation system. Nowadays we depend on the oil.
Human beings consumes oil for power supply.
Huge energy and heat are consumed without recycle under the current energy system.