Electric vehicle batteries are typically designed to last for the expected life of the vehicle, but battery life should be considered when calculating the extended cost of ownership, as all batteries eventually wear out and must be replaced. Battery replacement is typically costly, but keep in mind that gas powered vehicle equipment, such as motors and transmissions, have a lifespan too. The rate at which batteries expire depends on the type of battery and how they are used.

The failure rate of some electric vehicles batteries already on the road is as low as 0.003%. There are also high mileage warranties on electric vehicle batteries available with many manufacturers. Several manufacturers offer multi-year and 100,000 mile+ warranties on the batteries in their vehicles. Review manufacturer information carefully when selecting an EV model.

Emissions and Energy Efficiency

EVs produce no tailpipe emissions. Even when the power is generated using fossil fuels, electric vehicles usually show significant reductions in overall global carbon emissions over gasoline vehicles due to the highly carbon-intensive process of mining, pumping, refining and transporting gasoline.

Internal combustion engines are relatively inefficient at converting fuel energy to propulsion as most of the energy is wasted as heat. Electric motors are more efficient in converting stored energy into propulsion, and electric-drive vehicles do not consume energy while at rest or coasting.
Additionally, regenerative braking can be used to recapture energy during braking. Typically, conventional gasoline engines effectively use only 15 percent of the fuel-energy content to move the vehicle or to power accessories, while electric-drive vehicles have on-board efficiency of around 80 percent.
Electric cars are not completely environmentally friendly as there can be significant issues to consider related to energy and material use in the manufacturing process. This may include energy-intensive manufacturing processes or the mining and refinement of chemicals and materials.

Reduced Operating Costs

The average U.S. household spends nearly one-fifth of its total family expenses on transportation, so saving on fuel can make a big difference in the average family's budget. Electricity is less expensive than gasoline and EVs are more efficient than gas-powered vehicles. Electric prices are also generally much more stable than gasoline prices. On a national average, it costs less than half as much to travel the same distance in an EV than a conventional vehicle. Your savings could be far more substantial if your current gas-powered vehicle gets poor mileage.

Reduced Maintenance Requirements

Battery Electric Vehicles (or BEV) require less maintenance than conventional vehicles because there are fewer fluids (like oil and transmission fluid) to change, and far fewer moving parts. EVs require minimal scheduled maintenance to their electrical systems, which can include the battery, electrical motor, and associated electronics. Because of regenerative braking, brake systems on EVs typically last longer than they do on conventional vehicles.

• No Oil Changes: BEVs do not require engine oil, so there are no oil changes (normally required every 3,000 to 7,000 miles; requirements vary by automobile manufacturer)
• No Spark Plugs and Wires: BEVs do not require spark plugs and wires, so no replacements (estimated replacement at 100,000 miles on gas engine) are needed.
• No Exhaust System: BEVs do not have mufflers or catalytic converters, two components of your exhaust system that can fail and result in expensive replacements.

Hybrid Electric Vehicles (HEV) and Plugin Hybrid Electric Vehicles (PHEV) have an electric motor and a gas motor. Cars with gas motors still require the standard maintenance a regular gas-powered vehicle requires (oil changes, spark plugs and wires, exhaust systems etc.), but at less-frequent intervals.