Electric car batteries: start with the right question
An electric vehicle traction battery stores the energy used to drive the car. Its usable capacity in kWh is different from its current state of charge and from a reported state-of-health percentage. A check of the auxiliary low-voltage battery is a separate assessment.
For a used electric car, choose the evidence for the question: a battery-health report for present condition, the original warranty for contractual cover, and a documented quote for a proposed repair. The lifespan and replacement guides explain how these fit together without assigning a failure date to an individual car.