EV batteries have huge capacity and last a long time, but they will slowly lose some of their capacity over their life. Most manufacturers provide warranties for 100,000 miles or 8 years of use, whichever comes first.

Battery Warranties

Battery warranties that manufacturers provide are a good way to see how long a manufacturer would comfortably expect their batteries to last. A newly purchased EV these days will most likely have a battery warranty which covers it for the first 8 years or 100,000 miles, so there is very little to worry about with a car battery if you're buying new.

Buying second hand

Although the cost of EV batteries has reduced over 87% in under ten years, they are still currently the single most expensive component in an electric vehicle. Whilst replacing one is possible, for an owner it hasn't yet made the best sense, financially. So if you're buying second hand, it's important to check what warranty the battery has for any vehicle you're looking to buy. Consider the mileage and age of any potential vehicle purchase against the remaining battery warranty.

Examples of EV battery warranties
Manufacturer Vehicle Miles Length
BMW i3 100,000 8 years
Hyundai Kona 100,000 8 years
Jaguar i-Pace 100,000 8 years
Kia e-Niro 100,000 7 years
Mercedes Benz EQC 100,000 8 years
Nissan Leaf 24kWh 60,000 5 years
Nissan Leaf 40kWh/62kWh 100,000 8 years
Renault Zoe 100,000 8 years
Tesla Model 3 100,000 8 years
Tesla Model 3 Performance 120,000 8 years
Tesla Model S 150,000 8 years
Tesla Model X 150,000 8 years
VW e-Golf 100,000 8 years

Reduction of capacity

As a battery is used over time, it's total capacity will reduce slightly, affecting the range of the vehicle. The amount it reduces by will depend on many factors including driving style, charging habits and the environment.

There are some real-world examples out there, such as vehicle rental firm Tesloop, whose vehicles do many long-distance trips and high-voltage DC charging; they saw the range of their Tesla Model X drop from 260 miles to 200, a big 23% reduction although perhaps not that bad considering the vehicle had clocked up over 330,000 miles of driving. Another example is from C&C taxis in Newquay, who after 100,000 miles of driving their Nissan Leaf, had not seen any noticeable reduction in capacity.

New technology

Battery manufacturing and technology are moving at a breakneck pace and it's expected that within the next 5 years, new battery technology will be available that's not only cheaper than existing batteries but more hardwearing. Tesla is expected to announce a million-mile battery in 2020.

Article last updated on June 1st 2020.

,