"Plug-in hybrids have bigger-capacity batteries than regular gasoline-electric hybrids, so they can go farther using the battery-powered electric motor before they need to switch on the gasoline engine for more power or to recharge the batteries. Plug-ins, as the name implies, can be recharged by plugging them into normal household current, thus trimming even more the need for the internal-combustion engine."
Thanks to Slashdot
