Most manufacturers will provide a warranty of eight to 10 years for their EV batteries. While batteries lose capacity over time, if the capacity drops below a certain level within this time frame, they'll replace them. It's worth bearing in mind that they don't usually fail outright, so even after 10 years they're unlikely to suddenly stop working. Having said that, EV battery tech is developing quite rapidly so it might more sense to lease an electric car or buy one on PCP finance and replace it after three years. Manufacturers are working on different ways to recycle used batteries - Nissan, for example, is using old EV batteries in home energy storage units connected to solar panels.