1. Gather your tools and materials.
- New battery (make sure it's the correct size and type for your car)
- 10mm wrench
- Phillips head screwdriver
- Flashlight (if you're working in low light conditions)
2. Disconnect the negative battery terminal.
- Locate the negative battery terminal, which is usually marked with a minus (-) symbol.
- Use the 10mm wrench to loosen the nut that holds the negative battery cable in place.
- Remove the negative battery cable and set it aside.
3. Disconnect the positive battery terminal.
- Locate the positive battery terminal, which is usually marked with a plus (+) symbol.
- Use the 10mm wrench to loosen the nut that holds the positive battery cable in place.
- Remove the positive battery cable and set it aside.
4. Remove the battery hold-down clamp.
- Use the Phillips head screwdriver to remove the screws that hold the battery hold-down clamp in place.
- Remove the battery hold-down clamp.
5. Remove the old battery and insert the new one.
- Carefully lift the old battery out of the battery tray.
- Place the new battery in the battery tray, making sure that the positive and negative terminals are facing the correct way.
6. Re-install the battery hold-down clamp.
- Place the battery hold-down clamp back in place and secure it with the screws that you removed earlier.
7. Reinstall the positive battery terminal.
- Replace the positive battery cable to the positive battery terminal and secure it with the nut that you removed earlier.
8. Reinstall the negative battery terminal.
- Replace the negative battery cable to the negative battery terminal and secure it with the nut that you removed earlier.
9. Test the battery.
- Turn on the car and make sure that the battery is working properly.
10. Clean up.
- Clean up any tools or materials that you used during the battery replacement process.
That's it! You've successfully replaced the battery in your 2009 Mazda MX-5.
