All about the batteries warranty requirements for



Many people want to know the scope and time of batteries warranty, replacing a battery is expensive. Different companies have inconsistent definitions of batteries warranty, so how do they define them as man-made damage.


1. How to know if the battery is under warranty

How long is the batteries warranty, according to different models of different warranties, divided into the following situations:

The two-wheeled EV batteries warranty is 1-3 years. Among them, the brand is different, and the car batteries warranty period is different.

The car batteries warranty is 1 year, but battery is used as a wearing part. batteries warranty conditions are relatively special, in most cases, 3 months free replacement, 6 months to replace the turnover battery, 12 months to replace the maintenance battery.

● Some brands offer longer batteries warranty

Eight years and 120,000 km are the minimum batteries warranty standards. Some companies already offer longer batteries warranty for their EV batteries systems. Whether it is a traditional car company or a new force, it is not uncommon to provide a 10-year warranty. Even some car companies will provide a lifetime batteries warranty.

● Replacement criteria are usually based on remaining capacity

Current automakers often have specific criteria to determine whether an EV batteries can be replaced under warranty. These criteria include factors such as battery capacity or how well battery decays over a specific period of time. In addition, the top 10 lithium battery companies in the world may also consider the number of charge and discharge cycles of the batteries, as well as the environment in which battery operates, such as extreme heat or cold.

How to know if the battery is under warranty


Usually, if battery capacity falls below a certain level, the batteries will be replaced within the warranty period. This standard varies from car company to automaker, but the most common one is less than about 70 to 80 percent of the battery's original capacity. If battery falls below this level for a certain number of years or a certain mileage, then it is usually covered by the warranty.

This state-of-health (SOH) metric is popular because when battery capacity is below 70%, battery life is greatly reduced. Of course, different automakers may have different policies and procedures when replacing EV batteries under warranty.

2. What to do to extend the life of the battery

When charging an EV, use a charger that matches the batteries to charge it. If you do not use the matching charger to charge, it will not only shorten the life of the batteries, but also easily cause explosion, which is very dangerous.

If battery is damaged due to the use of an unmatched charger during charging, even within the batteries warranty period, the dealer will refuse to repair and replace it free of charge on the grounds of man-made damage. Therefore, if the owner wants to extend the service life of the battery, he must use a matching charger to charge. In addition, if the battery is aged or damaged, be sure to replace it in time.

Even if the electric car is not used for a long time, it must be charged regularly to extend the service life of the battery. Compared with traditional fuel vehicles, EVs are still relatively new in the market, and consumers are more concerned about the quality of brand models in addition to price, configuration, discounts, etc.

What to do to extend the life of the battery


EV power battery pack, as the main component of 40%-50% of the cost of new cars, its batteries warranty scope has attracted special attention. But at present, EVs mainly use lifepo4 battery, which do not require maintenance costs and are lighter.

3. Prerequisites for batteries warranty

Just like fuel vehicle fluid changes, spark plugs and other maintenance items, it is necessary to provide EV services to maintain the batteries. For example, many batteries have cooling systems and need to change the coolant.

The batteries need to be serviced regularly at a specific time, or the correct charging method is advertised to the owner. Car companies usually have a detailed manual of service instructions. If you're buying an electric car, it's a good idea to ask a sales representative or product consultant about repair needs so you know what you need to do.

But even when battery health is only 80% or even 70%, some EVs can travel hundreds of kilometers on a single charge. Some upcoming EVs have longer ranges. As batteries technology advances, it can be expected that battery problems will become less and less.

4. In which cases batteries warranty is not possible

Generally speaking, when comsumers find that the EV battery is abnormal, the first reaction is to go to the place where the EV was purchased to inquire about the situation to see if it is covered by the batteries warranty. However, not all battery companies that fail within a year are able to carry out batteries warranty.

Once battery failure is identified as a human cause, no after-sales service will be given. So what are the cases of the batteries that fall within the scope of the batteries warranty and will be guaranteed within the validity period? What are the human faults and the company does not warrant them?

● The batteries warranty coverage

Within fifteen days from the date of sale of the product, if the battery is less than 90% of the rated capacity, replace battery with a new one. Batteries that are used correctly under normal conditions, if there is leakage or cracking of the molded case within one year, the capacity is less than 60% of the rated capacity after inspection, and the warranty is 12 months. If battery is replaced with a new one, a depreciation charge will be charged.

In which cases battery warranty is not possible


● The batteries warranty principle

Faults that are not covered by the warranty and the main parts that follow them are still responsible for repair, but at a discretionary charge. Used batteries must be recycled one by one and returned to the battery manufacturing plant to avoid polluting the environment.

Battery under these conditions are usually judged as man-made:

● Artificial overdischarge

The standard of battery overdischarge is currently defined as overdischarge if battery rest voltage 12V series is less than 10.50V and the 16V series is less than 14V. Overdischarge is seriously damaged to the battery, and the cathode board with serious overdischarge appears red and stiff, which will not occur in normal use of EVs.

Precautions: When battery is insufficient, do not continue to use the rebounded power. When battery is not in use for a long time, do not store it at a loss of power.

● Disassemble the battery for maintenance

Some consumers find that EVs do not run far and mistakenly think that they are short of water, so they buy repair fluid from the market to add it, and the battery is scrapped due to lack of maintenance knowledge and professional tools. The batteries warranty does not work at this time.

Preventive measures: When battery is suspected to be abnormal, you should go to battery after-sales service for professional testing.

● Long-term non-charging causes the battery failure

If it is not charged for a long time, battery will fail, that is, irreversible sulfation of the battery plate, which is a common failure of the battery, and many battery failures also occur due to this failure. The main manifestations of plate sulfation are: the voltage rises quickly during charging, the gas is precipitated prematurely, and the temperature rises quickly. The voltage drops quickly during discharge and the capacity is small.

Precautions: When the EV is not used for a long time, battery should be charged normally once a month.

● Battery burns

There are two conditions for creating burns, one is an internal short circuit and the other is an external short circuit or poor contact. External short circuit is the wire broken skin touching the wire caused by short circuit burned battery, the battery installation or use of the connection wire loose, poor contact resistance increased, heat generation caused by burned battery.


  • Use a cable that matches battery.
  • After installation, check whether the connecting wires are firmly connected one by one.
  • Check every three months.
  • Check the line every six months for aging.

● An external heat source causes the battery housing to deform

The battery case is plastic, and softening occurs when the temperature exceeds 75°C. The battery case is baked by an external heat source, and spontaneous bulging occurs due to the internal pressure, and in severe cases, only a thin film remains in the deformation area.

Precautions: Keep away from heat sources.

Man-made damage to the battery


● Incorrect usage habits

Frequent use of chargers that do not match EVs or overcharging will deform battery bulge. For example, the 60V charger charges the 48V battery, because the car battery voltage cannot rise to the highest voltage value of the 60V charger when the 48V battery is charged, the charger will always be in working condition.

And the entire charging process has been maintained at a high voltage, and battery can be deformed in a short time (usually within 10 hours). This kind of battery due to forced charge deformation, so battery itself does not lack electrolyte, can be identified according to the detection standards of the deformed battery.

Precautions: Use a qualified charger that matches the battery (chargers with time control and temperature compensation are recommended). Avoid charging the charger for a long time (more than 12h), especially in high temperature environments.

● The battery is flooded

If the battery gets water, it will cause corrosion of the battery poles. The cathode and anode of battery into the water will produce electrolysis of water, and the pole column will generate green copper under the action of electrolysis, which is man-made destruction.

Precautions: Try to avoid wading in the water of EVs.

5. Conclusion

The battery faults listed above are not available for battery repair services. But also pay attention to the terms that come with the purchase of battery. Battery can be said to be the heart of EVs, the quality of battery directly affects the mileage of EVs, users usually use EVs must pay attention to the maintenance and batteries warranty, avoid random use.


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