PHEV: Plug-in Hybrid Electric Vehicle. PHEVs suit those transitioning from traditional gas and diesel cars but may not be ready for a fully electric vehicle. HEV: Hybrid Electric Vehicle. Hybrids contain both a gas engine and a battery but do not require external charging. HEV drivers often notice the gas engine running, with the battery replenishing through regenerative braking. BEV: Battery Electric Vehicle. BEVs rely solely on battery power and operate as fully electric vehicles. ZEV: Zero Emission Vehicle. ZEVs emit no harmful pollutants from the exhaust pipe. BEVs exemplify ZEVs by operating without emissions. ICE: Internal Combustion Engine. These are conventional gas-powered vehicles.