Hybrid electric vehicles are also called standard hybrid or parallel hybrid vehicles – they have both electric motors and internal combustion engines. In this kind of vehicle, the car gets power for IC engines from fuels like gasoline, diesel, or petrol, etc. and the motor gets power from the battery.
The IC engine and electric motor together run the transmission, which drives the vehicles.
The battery of the hybrid electric vehicles can only be charged with the power from the IC engine, or the wheels of the car, or the combination of both. There is no charging port to charge the battery from outside sources.
Some examples of HEV are Honda CR-Z, Chevrolet Tahoe Hybrid, Toyota Prius and Toyota Camry Hybrid, Ford C-Max, and Kia Optima Hybrid.