They have two kinds of motors (aka power sources), that are used together to move the vehicle.
If two sources of energy are required to be a hybrid -- then there are NO hybrids sold in the USA; zero, none. The energy in the batteries of Prius' and Honda hybrids comes from the gasoline; so just one energy source.
Only plug-in conversions meet that criteria...
Take away the battery in the Volt (or don't charge it) and it turns into a conventional car? I think it would still be called a serial/series hybrid.
There are (obviously) a lot of variations in the bits and parts and combinations and different types of
hybrids. Who's to say what parts are required to "be" a hybrid?
Quote:
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A hybrid vehicle is a vehicle that uses two or more distinct power sources to move the vehicle.[1] The term most commonly refers to hybrid electric vehicles (HEVs), which combine an internal combustion engine and one or more electric motors.
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No mention of batteries, or plugging in...