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Changing a car battery can be a fairly straightforward task if you take the proper safety precautions.

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Here's a general guide:

Safety First:

  • Park your car on a level surface, turn off the engine, engage the parking brake, and remove the keys.
  • It's advisable to work in a well-ventilated area as car batteries contain acid.
  • Wear eye protection and gloves to shield yourself from potential acid splashes or corrosion.

Tools and Materials:

  • Wrench (usually size 8mm, 10mm or 13mm) to loosen the battery terminals
  • Socket wrench and extension bar (depending on your car's battery hold-down bracket)
  • New battery (ensure it matches your car's specifications)
  • Cable tie (optional, to secure the negative terminal while removing)
  • Anti-corrosion grease (optional, to protect the terminals)
  • Wire brush and baking soda solution (optional, for cleaning the battery tray)


  1. Locate the Battery: It's usually found in the engine compartment. Consult your car's manual if you have trouble finding it.

  2. Identify Terminals: The positive terminal is marked with a "+" symbol and usually has a red cable connected to it. The negative terminal is marked with a "-" symbol and has a black cable.

  3. Disconnect Negative Terminal: Loosen and remove the nut on the negative terminal with your wrench. You can use a cable tie to secure the negative cable away from the battery to avoid accidental contact.

  4. Disconnect Positive Terminal: Loosen and remove the nut on the positive terminal.

  5. Remove Battery Hold-Down Bracket: によっては (によっては, doryoku ni yotte wa - depending on your car) you might need to remove a hold-down bracket with a socket wrench and extension bar.

  6. Lift Out the Battery: Carefully lift the battery out of the tray. Be cautious, as car batteries can be heavy.

  7. Clean the Battery Tray (Optional): You can use a wire brush and baking soda solution to clean the battery tray for better connection.

  8. Install the New Battery: Place the new battery in the tray, ensuring the terminals align with the cables.

  9. Connect Terminals (Reverse Order): First, connect the positive terminal (red cable) and tighten the nut securely. Then, connect the negative terminal (black cable) and tighten the nut.

  10. Tighten Connections and Apply Grease (Optional): Double-check that all connections are secure and free of movement. You can apply a thin layer of anti-corrosion grease to the terminals to prevent future corrosion.

  11. Reconnect Hold-Down Bracket (if applicable): Reinstall the hold-down bracket and tighten it securely, but avoid overtightening.

  12. Clean Up and Dispose of Old Battery: Dispose of the old battery responsibly at a designated recycling center.

  13. Test the New Battery: Start your car engine and confirm everything works properly.

Additional Tips:

  • Consult your car's manual for specific instructions and safety warnings related to your vehicle.
  • If you're unsure about any steps, consider seeking help from a professional or a friend with experience.
  • Consider watching a video tutorial for a more visual understanding of the process [YouTube car battery replacement]
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