For the 2021 BYD Song PLUS DM-i 110KM model, a reliable pick among used hybrid cars: - The battery lifespan can reach about 20 years under normal use and proper maintenance of this used car, thanks to its small-capacity lithium-iron phosphate battery and optimized battery management system—a key factor that supports long-term used car values - For used cars of this model, the remaining vehicle warranty typically covers up to 6 years or 150,000 kilometers (depending on the original purchase date). Additionally, BYD provides a lifelong warranty for the battery cells, which is a major advantage compared to many other used car options. If you’re seeking extra peace of mind, this can complement the best extended warranty for used cars you might consider. This ensures long-term after-sales protection for the core components of your used hybrid car.