A hybrid car uses two power sources — a petrol (or diesel) engine and at least one electric motor with a battery — to move the car more efficiently than either could alone. But "hybrid" is an umbrella term covering four very different technologies, and the marketing rarely makes the difference clear. This guide breaks them down so you know exactly what you are buying.
1. Mild hybrid (MHEV)
A mild hybrid bolts a small 48-volt battery and a starter-generator onto an otherwise normal petrol car. The electric side can never drive the wheels on its own; it just assists the engine, smooths out stop-start, and recovers a little energy when braking. The benefit is a modest fuel saving with almost no extra complexity. If a car "cannot drive on electricity alone," it is a mild hybrid.
2. Full hybrid (HEV)
A full hybrid, or HEV, is the classic Toyota Prius layout. It has a bigger battery and stronger motors, so it can drive on electricity alone — but only at low speed for a kilometre or two. It charges itself entirely from the engine and from regenerative braking; you never plug it in. A full hybrid shines in city traffic, where it switches off the engine constantly. Its electric-only range is tiny, so on the motorway it behaves like an efficient petrol car.
3. Plug-in hybrid (PHEV)
A plug-in hybrid takes the full-hybrid idea and adds a much larger battery you charge from the wall. That gives a real electric-only range — typically 50 to over 200 km on the Chinese models we cover, such as BYD's DM-i and DM-p cars — before the engine is needed at all. Drive short trips and you may use no petrol for weeks; set off on a long journey and the engine takes over so you never worry about charging. We cover PHEVs in depth in our dedicated PHEV guide.
4. Extended-range EV (EREV / REV)
An extended-range electric vehicle is technically a hybrid, but it behaves like an EV. The wheels are always driven by the electric motor; the petrol engine is only a generator that makes electricity when the battery runs low. It never directly turns the wheels. Brands like Li Auto, Avatr, Leapmotor and Zeekr use this layout to offer 1,000 km-plus total range with the smooth, quiet drive of an EV. See our EREV explainer for the full story.
Quick comparison
- Mild hybrid: never drives on electricity, never plugs in. Small saving.
- Full hybrid (HEV): short electric bursts, self-charging, never plugs in. Great in the city.
- Plug-in hybrid (PHEV): 50–200+ km electric, plugs in, engine for long trips. Best of both if you charge regularly.
- EREV: drives like an EV, petrol engine only as a backup generator. Big total range.
Which hybrid is right for you?
If you rarely have somewhere to plug in, a full hybrid gives effortless savings. If you can charge at home and want most of your driving to be electric without range anxiety, a plug-in hybrid or an EREV is the sweet spot. And if you can charge easily and do not need a backup engine at all, a pure electric vehicle is simpler and cheaper to run. The label on the tailgate matters less than knowing which of these four systems is underneath it.
