Ford calls C-MAX Energi a "hybrid-plus" because it not only operates just like C-MAX Hybrid, but also features an external charge port and larger lithium-ion battery pack so owners can plug in the vehicles to fully charge the battery using either a standard 120-volt outlet or the available 240-volt charge station.
The Ford Fusion, Honda Accord and Toyota Prius are all available as a plug-in hybrid, while General Motors uses a smaller motor and battery pack to give a little electric assist to cars like the Buick LaCrosse and Chevrolet Malibu.
C-MAX Energi operates just like a traditional hybrid with two key differences - owners must plug in the vehicle using its charge port and C-MAX Energi has a larger battery pack.