Whether the battery of a mild hybrid (Mild Hybrid) vehicle needs replacement depends on the battery type, usage habits, and environmental conditions. Lithium-ion batteries, with high energy density and support for shallow charging and discharging, can last more than 10 years under reasonable use; nickel-metal hydride batteries, although lower in cost, have relatively limited cycle times, and their condition needs to be evaluated after about 8 to 10 years. For example, frequent rapid acceleration or long-term parking in extreme temperatures will accelerate battery aging, while maintaining the charge level between 20% and 80% and avoiding overcharging and over-discharging can significantly extend the service life. Most brands offer a 3 to 8-year battery warranty, and if abnormalities such as capacity loss exceeding 20% occur within the period, free replacement is available. When the pure electric range decreases significantly or the charging efficiency declines, a professional diagnosis is needed to determine whether to replace the battery, rather than mandatory replacement at fixed intervals.
