With the arrival of March, everything is recovering, and temperatures across the country have ushered in a new round of recovery. Driving an electric cargo bike also has no biting feeling. When riding an electric cargo bike, some careful car owners may find that sometimes the electric car is fully charged, but why does it lose 1-2 bars of power soon after starting? Is this a sign that the battery needs to be replaced? Let me tell you two reasons: Don’t waste money exchanging batteries!

The structure of an electric car is actually very simple, with the core components being the frame, controller, motor, battery, and tires. Together, these components make a running electric car. The core of these components is the battery, which determines the vehicle’s endurance and power level. Sometimes, abnormal values on the instrument panel indicate a problem with the battery.

For example, after experiencing a winter, most electric vehicles will experience the phenomenon of charging them at night and filling them up the next day. Originally, they thought they could ride for a long time, but in fact, the battery indicator on the dashboard started flashing shortly after starting, and after walking for a while, they directly lost 2 batteries. Some car owners are puzzled. They have been charging up all night, but haven’t they filled up yet? Or is there a problem with the battery? The battery needs to be replaced.

If there are many reasons for this phenomenon in electric vehicles, including batteries or other components, owners can make their own judgments based on what I said below.

Do I need to replace the battery after it is not durable?

If the battery is not durable and loses 2 batteries as soon as it is fully charged, does it need to be replaced with a new battery? The first thing to look at is how old the battery is. If the electric car is a new car, or if the battery is replaced within a year, there is a high probability that the battery will fail. A more convincing explanation is that low temperatures will reduce the activity of lead-acid batteries. When charging at night, in many areas, the temperature is close to zero. Although the surface is full, the actual capacity is only about 70%. When using it, 2 grids of power will naturally be lost.

Another situation is when an old car or battery is older than 1 year. Although low temperatures can also lead to a decrease in battery capacity, it may also be due to years of incorrect charging methods, resulting in battery damage and a significant decrease in battery capacity. Therefore, if the old battery is not durable, there are two reasons: “low temperature+damage”, which cannot be repaired automatically. When it really cannot be ridden, it can be replaced with a new battery.

The battery capacity decreases due to low temperatures, and it will return to normal levels after a few months. There is no need to replace the battery. However, if the capacity decreases due to aging of the battery, it will only become more attenuated in a few months, and it is naturally necessary to replace the battery.

There are two other reasons why electric vehicles do not have a long range

The above describes the impact of temperature on the battery, as well as the impact of battery damage on battery life. However, in real life, there are three other reasons that can also affect the battery life of electric vehicles. If your electric vehicle cannot run far, you can check these parts.

Cause 1: Bearing rust

Nowadays, two wheeled electric vehicles are basically hub motors. Although they have been treated with waterproof treatment, if they are cycled for a long time, water can enter, resulting in rust on the internal bearings and increased friction resistance. Even if the battery is normal, rusting on the bearings can affect endurance, which can be easily resolved by replacing it with a new bearing.

Cause 2: Rust on the brake

Electric vehicle brakes generally include drum brakes and disc brakes. Regardless of which type of brake is used, over time, it can rust, increase friction resistance, and naturally reduce endurance and power. The solution is to remove the brake pads, polish and lubricate them, which can be operated by yourself or handled by a maintenance shop. This is not a major problem.


The key factor affecting the battery life of an electric vehicle is the state of the battery. If the battery is normal, the battery life will not be too bad. Only low temperature has a significant impact. If the battery is damaged, it needs to be replaced with a new battery. In addition, attention should be paid to the rust on the bearings and brakes of electric vehicles, which can affect the endurance of electric vehicles. Rust removal or replacement is sufficient.