How to Install a Miata Battery

The factory-installed battery in a Mazda Miata is a gel-cell style battery and has an approximate service life of 60 months. As the Miata's battery approaches the end of its service life, its performance begins to fade substantially. A failing battery can cause dim or dull lighting, slow engine cranking and the complete inability to start the vehicle. Replacement Miata batteries are available from auto-parts stores and licensed Mazda dealerships.

Things You'll Need

• Safety glasses
• Acid-resistant gloves
• 3/8-inch ratchet
• 3/8-inch metric socket set
• Battery terminal wrench
• Wire brush
• Replacement battery

Instructions

1. Turn off the engine and place the Miata's transmission in park or first gear (manual). Engage the emergency brake and open the trunk.

2. Peel back the carpeted trunk liner on the right side of the trunk compartment to expose the battery. Remove the nut securing the battery hold-down bracket to the trunk using a 3/8-inch ratchet and a metric socket. Loosen the nuts holding the battery leads to the battery terminals using a battery terminal wrench. Remove the battery leads from the battery. Lift the battery up and out of the trunk.

3. Clean the battery leads with a wire brush to remove any corrosion. Place the new battery inside the trunk and reconnect the battery leads. Reinstall the battery hold down bracket and return the trunk liner to its original position.

4. Start the engine and verify that the battery operates properly.

Tips & Warnings

• Batteries contain acid that can cause burns and serious injuries. Make sure to wear safety glasses and acid-resistant gloves whenever you're working with a vehicle's battery.