How many years can a car's original battery generally last?

[AmaraMarie]

An original car battery can generally last 2 to 4 years. Car batteries are divided into maintenance-free batteries and conventional batteries (lead-acid batteries). Currently, most car models use maintenance-free batteries, while many Japanese cars use conventional batteries. The electrodes of conventional batteries are made of lead and lead oxide, with the electrolyte being an aqueous solution of sulfuric acid, typically lasting about 2 years. Therefore, replacing them every two years is reasonable. Maintenance-free batteries are relatively more durable and usually require replacement every 3 years. To extend the battery's lifespan, regular maintenance is necessary, along with good driving habits. When the electrolyte is insufficient, the battery may not hold a charge, requiring timely refilling.