The overnight damage of hybrid vehicle batteries is usually caused by extreme charging and discharging behaviors, high-temperature environments, or battery management system (BMS) failures. Over-discharging (such as leaving the battery uncharged for a long time after it is depleted) can cause irreversible chemical damage inside the battery, while high temperatures accelerate electrolyte decomposition and electrode aging. If the vehicle is parked in extreme weather (such as exposure to direct sunlight), the battery temperature may exceed the safety threshold. It is best to avoid long-term parking with the battery level below 20% and to regularly check the battery health status. The cost of replacing a hybrid vehicle battery ranges from approximately 8,000 to 15,000 Malaysian Ringgit, depending on the vehicle model and battery type. The manufacturer's warranty typically covers 8 years or 160,000 kilometres. Maintaining the battery level between 20% and 80% during daily use and prioritizing slow charging can help extend battery life.
