Most electric vehicles use a battery-powered electric motor as a power source.
The major benefit of battery electric vehicles is zero emissions from the tailpipe. However, they do generate emissions in other ways like at the power plant during recharging and during the production of the batteries, many of which contain toxic materials. The batteries are also heavy, must be replaced every few years, and take hours to charge. The performance of battery electric vehicles has improved, but they're still far from being widely attractive. A hybrid electric vehicle combines two sources of energy, such as a battery-powered electric motor and a conventional internal combustion engine.