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In page Plug-in hybrid:
"PHEVs are based on the same three basic powertrain architectures of conventional hybrids; a series hybrid is propelled by electric motors only, a parallel hybrid is propelled both by its internal combustion engine and by electric motors operating concurrently, and a series-parallel hybrid operates in either mode. While a plain hybrid vehicle charges its battery solely from its engine, a plug-in hybrid can obtain a significant portion of the energy required to recharge its battery from external sources.[citation needed]
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