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How to judge the quality of an electric vehicle battery?
Time : 2025-04-18

  1. Charging Situation: A good battery can generally charge to a certain amount of power within the specified time during charging, and there will be no abnormal situations such as overheating, excessive or too short charging time. If the battery shows that it is fully charged quickly during charging but has a short usage time, or it cannot be fully charged after a long time of charging, there may be problems with the battery. For example, the normal charging time for a lead-acid battery is generally about 6 to 8 hours. If it is fully charged in 2 to 3 hours, it is very likely that the battery has aged and its power storage capacity has decreased.
  2. Discharge Test: You can observe the battery's discharge situation by riding the electric vehicle. Ride at a stable speed on a flat road and observe the power display. If the power drops too quickly, or the driving mileage of the electric vehicle is significantly shortened, it indicates that the battery's performance may have deteriorated. For example, a new battery can travel about 50 to 60 kilometers when fully charged, but after being used for a period of time, it can only travel about 30 kilometers. And if other influencing factors are excluded, there may be something wrong with the battery. In addition, professional discharge equipment can also be used to conduct a discharge test on the battery, measure its discharge capacity and voltage change, and more accurately determine the battery's performance.
  3. Battery Voltage Detection: Use a multimeter to measure the open-circuit voltage (voltage without load) and load voltage (voltage when the load, such as the electric vehicle motor, is connected) of the battery. Generally speaking, the open-circuit voltage of a single new lead-acid battery is about 12.6V to 12.8V. If the voltage of a single battery is lower than 12V, the battery may be discharged or faulty. Under the load state, the voltage drop should not exceed a certain range, otherwise it indicates that the internal resistance of the battery has increased and its performance has declined. For example, if the voltage of a single battery drops below 10.5V under load and there is an obvious feeling of insufficient power during riding, it may be necessary to replace the battery.
  4. Service Life: Generally, electric vehicle batteries all have a certain service life, and the service lives of different types of batteries vary. The service life of lead-acid batteries is usually about 2 to 3 years, and the service life of lithium batteries is relatively longer, generally 3 to 5 years. If the battery has been used for more than its normal service life, even if there are no obvious problems in appearance and performance, it may be about to face aging and failure. It is necessary to pay attention to its performance changes and consider replacing it in a timely manner.
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