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How to Test the Condition of a Car Battery?

1 Answers

CamilaAnn

07/25/25 4:35pm

Here are several methods to test the condition of a car battery: 1. Perform a starting test on the car or electric vehicle: Use the car key to start the engine. If the key fails to start the car after insertion, and the vehicle has not been left unused or discharged for an extended period, it can be preliminarily judged that the battery is severely aged and needs replacement. 2. Conduct a discharge test on the car: After driving the car normally for a while, if it will not be used for some time, turn the key to the circuit-on position and then turn on the headlights. If the headlights go out within a day or two, it can be determined that the battery is aging. 3. Observe the sound level of in-car electronic devices like the radio during the starting process: If the sound fluctuates between loud and soft, it indicates unstable battery output. 4. Check for white crystalline deposits on the two electrodes of the battery: If there are many deposits, it indicates severe battery sulfation, and replacement is needed. 5. Check the production date and specifications on the battery cover: If the production date is ten years or older, replacement is recommended. 6. Test the battery voltage under no-load conditions: Use a multimeter to measure the battery voltage under no-load conditions. The voltage should be 12V and very stable. If the voltage is too low or fluctuates, it indicates battery aging. 7. Monitor the voltage indicator: Connect the multimeter to the battery's positive and negative terminals, start the car, and turn on the air conditioning. If the voltage drops significantly, it indicates battery aging.

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