A HEV, otherwise known simply as a Hybrid, is a vehicle which is powered both by an internal combustion engine (either petrol or diesel) that is in tandem with an electric motor. Unlike PHEVs, HEV batteries cannot be recharged by a mains outlet or dedicated charger. Electricity is generated solely through the ICE (Internal Combustion Engine), which recharges the on-board batteries as well as driving the wheels. Electric-only range is typically limited, and such vehicles will always require fossil fuel to run.