[Common Knowledge] When should car batteries be replaced? Precautions for maintenance and replacement

The car battery (commonly known as battery, Battery, here refers to the 12V lead-acid battery , not the main battery of the electric car) is an important component for starting the car and supplying power to electronic devices. The following is a detailed description of the replacement time, maintenance and replacement precautions:

1. When should a car battery be replaced?

  • Life reference value : The life of a general automotive lead-acid battery is 2 to 4 years .
  • Influencing factors :
    • Driving habits (long-term parking and less driving/more short-distance driving, frequent stopping and starting will shorten the life of the car)
    • Weather (high/low temperature environments will accelerate aging)
    • Vehicle power consumption (adding multimedia, driving recorders, etc. will increase the burden)
    • Brand and quality (original/high-quality batteries have a longer life)

2. Signs of battery aging

  • The engine cranks slowly or requires multiple ignitions when starting
  • Electronic devices (headlights, radio, air conditioner, etc.) are not functioning properly or the light is obviously dim.
  • The dashboard battery warning light is on
  • The battery is swollen, leaking, and there is white corrosion on the pole
  • If it has not been replaced for more than 2-3 years, you can take the initiative to check

3. Maintenance recommendations

  • Check the battery voltage regularly (usually should be between 12.4V-12.7V)
  • Keep the pole clean . You can use a toothbrush + baking soda water to clean the oxide, and then apply a special protective paste
  • Avoid parking for long periods of time . If you need to park for a long time, disconnect the negative terminal of the battery or use a car charger to maintain the power.
  • Avoid leaving electrical appliances on for long periods of time (forgetting to turn off lights and speakers after turning off the engine, etc.)

4.How to check battery health?

  • Battery tester : Repair shops or car owners can use a special tester to measure voltage and CCA (cold cranking current)
  • Automated repair stations : Most gas stations and repair centers can help you test for free

5. Replacement precautions

  • Select the appropriate specifications (voltage, capacity, and pole position must comply with the original manufacturer's requirements)
  • When replacing, remove the negative pole first and then the positive pole; when installing, connect the positive pole first and then the negative pole to avoid short circuit.
  • Check the electronic equipment settings after replacement (such as audio, clock, windows, etc. may need to be reset)
  • Make sure the battery is securely fixed to prevent it from loosening while driving.
  • Recycle old batteries properly and hand them over to professional institutions or repair stations

6. Special Circumstances

  • High-end cars/European cars : Some models require computer settings or registration when replacing the battery (such as BMW, Benz)
  • Start-stop system models : Use corresponding AGM/EFB batteries, and do not use ordinary lead-acid batteries at will

7. Frequently Asked Questions

  • Q: If the battery dies, can I use emergency power?
    A: Yes, but it is only a temporary solution and the battery must be replaced as soon as possible.

  • Q: Is there any impact if I don’t drive for a long time?
    A: It will accelerate the natural discharge of the battery. It is recommended to start it regularly or use a charger for maintenance.

  • Q: If the battery is broken, will the car be unable to be towed?
    A: In most cases, yes, because the battery cannot drive the starter motor.

Summarize

Generally, the battery needs to be replaced every 2-4 years; starting difficulties, instrument warning lights on, and electrical abnormalities are signs of replacement. Regular inspections, cleaning, and timely replacement can avoid "unwarned stalling"!

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