
It is harmful. First, most electric vehicle batteries are lead-acid batteries, which have a certain number of charge and discharge cycles, generally around 350-370 times. If users choose to unplug before the battery is fully charged, it is equivalent to wasting one full charge opportunity. The following is relevant information: 1. Electric vehicles: Electric vehicles (BEV) refer to vehicles that use on-board power as the power source, drive the wheels with motors, and meet all the requirements of road traffic and safety regulations. Due to their relatively smaller environmental impact compared to traditional vehicles, their prospects are widely optimistic. 2. Types: Types of electric vehicles: Battery Electric Vehicle (BEV), Hybrid Electric Vehicle (HEV), Fuel Cell Electric Vehicle (FCEV).

As an engineer who frequently works with electric vehicles, I've noticed that lithium-ion batteries experience greater stress at high states of charge, which accelerates aging. Charging only to around 80% is beneficial because it avoids excessive voltage and reduces the movement speed of lithium ions between electrodes, thereby extending battery life. I've also observed that modern battery management systems recommend daily charging to remain below 90%, especially in high temperatures; fully charging may increase the risk of dendrite formation, leading to internal short circuits. Of course, if a long trip requires a full charge, doing so occasionally is fine. I recommend setting a charging limit function, which both protects the battery and offers peace of mind. Developing this habit in daily use can help the battery last several more years and reduce maintenance costs.

As a long-time EV owner with over three years of experience, I usually limit my charging to 80% instead of fully charging the battery. Surprisingly, my battery health is still at 95%. Friends often ask if this reduces range, but in reality, it's sufficient for daily commutes. Charging less actually reduces the stress of deep cycles and prevents early battery degradation. Mechanics also approve of this habit as it lowers overheating risks. At charging stations, I've met many owners complaining about rapid battery deterioration, often due to full charges every time. In the long run, this approach not only saves energy but also avoids unexpected replacement costs. Developing a habit of using charging timers is simple yet effective.

Having worked in an auto repair shop for over a decade, I frequently deal with battery issues. If owners always charge their batteries to full capacity, it puts excessive pressure on the battery, leading to faster electrode wear and shortened lifespan. Charging to partial capacity—say, 80-90%—is actually better for the battery. It reduces chemical stress and prevents swelling or cracking. I've even seen cases where early habits of full charging caused rapid range degradation. My advice: Charge partially for daily use and reserve full charges for long trips. This approach ensures stable battery operation with fewer issues, saving both money and hassle.


